Tag Archives: nasa

Science / Space Race

[August 17, 1961] Voyages of Discovery (Explorer 12)

6 Comments

Every so often, a discovery comes along that shatters our conception of the universe.  Galileo turned his telescope to the heavens and discovered moons around Jupiter – suddenly, it was clear that Earth was not the center of everything.  Roentgen and Curie showed that matter was not entirely stable, leading to our modern understanding of physics (and the challenges that come with the harnessing of atomic energy).  Columbus sailed to find Asia; instead, he was the first to put the Americas on European maps.

Until 1958, space was believed to be a sterile place, a black void in which the planets and stars whirled.  Maybe there was an odd meteoroid or two, and far away, one might find a big cloud of gas, but otherwise space was synonymous with vacuum. 

Then Explorer 1, America's first space mission, went into orbit around the Earth.  Its particle detectors, designed to measure the free-floating electrons and cosmic rays whizzing around up there, quickly became saturated.  Girdling the planet were hellish streams of energy, particles ionized by the sun and trapped by the Earth's magnetic field. 

Overnight, our idea of space was revolutionized; a few scientists had speculated as to the existence of the "Van Allen Belts," but the idea was hardly mainstream.  More probes were sent up to determine the nature of these belts.  Pioneer 5 went beyond far into interplanetary space and sent back news of a solar atmosphere that extended far beyond the shiny yellow bits – a field of particles and rays that went beyond even Earth's orbit.  Other probes returned maps of the turbulent region where the sun's field met Earth's. 

Space was hardly empty – it was a new ocean filled with waves, eddies, and unknowns to be explored.

Yesterday, Explorer 12 zoomed into orbit, NASA's latest voyager to ply the charged sea of space.  While it practically grazes the Earth at its closest point in its orbit, at its furthest, Explorer 12 zooms out a full 50,000 miles – a fifth of the way to the Moon.  Twice every 31 hours, the satellite studies the Van Allen Belts as well as the region of cislunar space, that variable region in which the Earth and the Sun fight for magnetic dominance. 

Armed with a battery of instruments like that carried by its spiritual predecessor, Explorer 6, the new probe also has several strips of solar cells covered with varying levels of shielding.  These will help determine the extent to which the Van Allen Belts will affect ship's equipment as they travel through the deadly particles.  The data will be of particular use to Apollo astronauts on their way to the Moon.

If Explorer 1 was the satellite Columbus of the Van Allen Belts, and Explorer 6 was John Cabot, then Explorer 12 will be Amerigo Vespucci, fully determining the contours of a new ocean whose depths had been but briefly surveyed before. 

Shiver me timbers, laddie.  It's an exciting time to be a sailor!

6 Comments Leave A Comment
Science / Space Race

[August 7, 1961] Day-O!  (Vostok 2 spends day in orbit)

2 Comments


by Gideon Marcus

For a few bright weeks, it looked as if the United States might be gaining in the Space Race.  Now, the Reds have pulled forward again with a most astonishing announcement: their second cosmonaut, a Major Gherman Titov, orbited the Earth in his "Vostok 2" for an entire day before coming safely back to Earth this morning.

As usual, details of the launch were not divulged until Comrade Titov was already in space.  He circled the globe a record 17 times (compare to his predecessor, Gagarin's, single orbit).  The flight lasted long enough that Americans had the unique, if not entirely pleasant, opportunity to both go to bed and awaken with the knowledge that a Russian was whizzing just a matter of miles over their house.

This flight comes almost on the heels of that of our second spaceman, Captain Gus Grissom, who flew into space for a comparatively puny 15 minutes on July 21.  For a few short weeks, the free world held the lead, if not in time in space, then at least number of astronauts.  The Soviets have now made that success look feeble.  In fact, I am now hearing rumors that astronaut John Glenn's suborbital Mercury flight, scheduled for next month, will likely be canceled.  There is no propaganda value left in half-measures, and besides, Shepard's and Grissom's flights taught us all there was to be learned from the Redstone launched missions.

Now, there is a whole lot of worry being dispensed by the newspapers over Titov's flight.  Many speculate that there is no way we can catch up to the Communists in our race for the Moon.  After all, our first orbital flight is still untold months away; before an American ever orbits the Earth, the Russians may have a space station or even a foothold on our nearest celestial neighbor.

I think these fears are unfounded.  Vostok 2 was almost assuredly the same type of ship as Gagarin's Vostok 1.  It was designed, like our Mercury, to endure several days in orbit.  The increase in orbits from 1 to 17 does not reflect a seventeen-fold increase in Soviet space capability – merely greater use of Vostok's full potential.

Similarly, the 15 minute flights of Freedom 7 and Liberty Bell 7 reflect but a tiny proportion of the Mercury spacecraft's endurance.  When the Atlas booster is on-line in a few months, you will see the American program accomplishing the same feats as that of the Soviets.  I'm willing to bet our lunar ship, which the National Aeronautics and Space Administration began work on earlier this year, will be done before its Russian counterpart, too.

We have to remember that the timing of the Soviet missions is designed for maximum psychological effect.  Without taking anything away from the 26-year old Titov's noteworthy trip, I note that it occurred just as tensions over Berlin reached their highest since the Commnunist blockade of 1948.  Khruschev is flexing his muscles, both on the land and in space, hoping that Kennedy will blink if the Soviets carry out their threat to wall off their side of Berlin from ours. 

Now is not the time to get discouraged.  Not in the Space Race, not in the Cold War.  As I've said before, the Race to the Moon is not a sprint; it's a marathon.

2 Comments Leave A Comment
Science / Space Race

[July 22, 1961] Into Space – and the Deep Blue (The Flight of Liberty Bell 7)

9 Comments


by Lawrence Klaes

After three failed attempts just this week, yesterday (July 21, 1961), astronaut Virgil I. “Gus” Grissom finally became this nation’s second (and the world's third) man to reach outer space.  Grissom achieved another sort of milestone when his spacecraft unexpectedly sank after splashdown – and almost took the astronaut with it to the bottom of the Atlantic Ocean!

Following a very similar mission profile to that of his predecessor, Alan Shepard, back on May 5, Grissom rode his Mercury vessel, which he christened Liberty Bell 7 (complete with a painted white crack on the hull) in an arcing flight across the Atlantic Ocean from Cape Canaveral’s Launch Complex 5 (LC-5) in Florida.

The reliable Redstone booster hurled the ton-and-a-half craft, some 262.50 nautical miles downrange and 102.76 nautical miles above the Earth’s surface Grissom’s 15-minute suborbital flight lasted just nine seconds longer than Shepard’s.  Of course, both flights were far shorter than Cosmonaut Gagarin's 90-minute flight in April.  That's because the Redstone simply isn't powerful enough to send a Mercury into orbit, unlike the unnamed ICBM the Soviets are using. 

Grissom’s flight was relatively short in both duration and distance, but our second American astronaut did get to experience a few moments of weightlessness, move his ship around, and view our home planet and the blackness of space as few have yet to do.  His view was better than Shepard's: The two portholes on Freedom 7 were replaced with a larger single window. 

The other improvement on Liberty Bell 7 was an explosive side hatch, to be activated in the event of emergency after landing.  It was a wise precaution, but it almost caused the Mercury program's first fatality.

After Grissom's splashdown in the Atlantic, while he waited inside his space vessel to be rescued by four Sikovsky UH-34D helicopters dispatched from the aircraft carrier USS Randolph, the explosive release on the Liberty Bell 7 side hatch suddenly activated, blowing the heavy metal door across the water like a skipping stone.  The Atlantic Ocean rushed into the now open spacecraft.

The Mercury astronaut prudently abandoned his vessel and waved frantically at the hovering helicopters to hoist him out of the drink: Grissom’s spacesuit was filling with sea water due to an open oxygen inlet connection and it began weighing him down.  The rolls of Mercury dimes Gus had taken along in his suit to later hand out as souvenirs were also contributing to his inexorable dip beneath the ocean surface.

Unfortunately, the lead helicopter pilot interpreted Grissom’s reaction as an indication that he was okay, so they focused on trying to rescue the sinking Liberty Bell 7 by attaching a cable to it>.

The flooding Mercury spacecraft soon became too heavy for the helicopter to lift from the water, and it threatened to bring down the chopper and its crew as well.  With no other choice, the rescue team detached Liberty Bell 7, which quickly sank to the bottom of the ocean over seventeen thousand feet below. 

Attention finally returned to the desperate astronaut.  Grissom grasped for the lowered harness.  Exhausted, he slumped in the harness as he was retrieved for his trip back to the rescue ship. 

It remains to be determined whether the premature explosion of the side hatch was caused by a mechanical defect or by manual release by Grissom, perhaps in a momentary panic.  Gus himself swears he was lying calmly inside the spacecraft when the incident occurred.  Whatever the real story, engineers will need to check the hatch escape system thoroughly to make sure it does not happen again – especially in space!  Perhaps this system will be more fully tested during the next Mercury mission, another suborbital flight scheduled for September, with John Glenn the anticipated pilot.

Intriguingly, in his post-flight briefing this morning, attended by his family and fellow astronauts, Grissom admitted to feeling “scared” when his vessel lifted off towards space.  The Mercury spacemen were chosen for their exceptional bravery and flying skills.  Yet, in the end, they are human.  Did Gus, who flew 100 combat missions during the Korean War and has had a long reputation as a top-notch pilot, have a moment of weakness when confronting the unknowns of outer space?  Is this what contributed to the release of the spacecraft hatch that caused the loss of the Liberty Bell 7 and nearly the astronaut as well?  Are there aspects about the vast realm beyond Earth that may make it impossible for a man to extensively explore and colonize space?

At the moment only three human beings have actually ventured into the alien void.  All have returned alive and unharmed; however, in all of these cases they made only the briefest of ventures into space.  Can someone survive the longer durations entailed in extended orbital missions?  What about manned expeditions to the Moon and other worlds in our Solar System?  Can man make it to those places in person and live to tell the tale?

In the end, there can be only one way to find out: by sending qualified men and eventually even women into the Final Frontier to confront what may be there and conquer it for the good of humanity. 

9 Comments Leave A Comment
Science / Space Race

[July 12, 1961] Reaction time (The launches of MIDAS 3 and TIROS 3)

7 Comments

My brother, Lou, used to tell me that the only way to beat a bully is to not fight fair.  Jump the guy when he's not looking, and fight like there are no rules.  That'll teach him that you're nuts and not worth messing with.

He learned this lesson honestly.  When Lou was in the navy, he immediately got flak for being Jewish.  Someone tried to steal his bunk; Lou rammed the guy's head into the wall.  After that, whenever someone tried to take advantage of Lou, by cutting in the chow line, for instance, another sailor would restrain the miscreant.  "Don't do it!  That's Marcus.  He's crazy.  He'll kill you!"

The problem is that these days, there are just two kids on the block: The USA and the USSR.  Each one's the bully in the other's eyes.  If the Russians decide they can get in a sucker punch, they just might do it to get us out of the way, once and for all.

We have the same option, of course, but it is the avowed intention of our leaders that America will never start a nuclear war.  The Soviets have not made such a pledge.

That's why we have invested so much time and money in developing a strategic nuclear force.  We want the Russians to know that we can strike back if they launch an attack, so that any attempt at a preemptive blow would be an act of suicide.

But we can't retaliate if the first indication we have a Soviet attack is the sprouting of atomic mushrooms over our cities and missile fields.

To that end, we recently finished the construction of the Distant Early Warning (DEW) line, a string of radar installations along the northern coasts of Alaska and Canada.  These can detect a missile some ten minutes from target.  Still not a very good window of time in which to order a counter-strike.

Enter MIDAS.  The MIssile Defense Alarm System satellite has infrared sensors.  As it flies over the Soviet Union, it will be able to detect the heat off a rising ICBM (or space shot, presumably).  Operated in a constellation of low-orbiting craft, there will always be one or two whizzing over the vast expanse of our enemy superpower.  This will raise the window of decision to a more-comfortable 30 minutes.

That should give the Soviet Union pause.  If they can't wind up a punch without us seeing and countering, maybe they won't wind up at all.

I've written about MIDAS before.  The difference this time is that the launch of MIDAS 3 today was freely covered in the press, and it looks like this may have been the first operational vehicle in the series.  In any event, it's one more use of space that benefits all of humanity…hopefully.

In a similar, if more benign vein, today NASA got up the third in its TIROS weather satellite series.  It replaces TIROS 2, which went off the air in January.  TIROS 3 is an improvement on its predecessors, incorporating two wide-angle cameras (the narrow-angle cameras having been eliminated as not particularly useful) as well as five infrared sensors to measure the Earth's heat budget.  I cannot stress enough how revolutionary the TIROS series has been.  Not only has it provided the first full pictures of large-scale weather patterns, but we're getting global climatological data, too.  In concert with the super-powerful computers now at our disposal, meteorology has entered a new age.

For those who live in the Gulf area or Florida, TIROS 3 will be of particular interest: it will be spotting those pesky hurricanes long before they hit the shore.  Again, outer space provides a valuable window of decision for folks on the ground…in this case, the decision whether or not to evacuate!

See you in two with the rest of the latest Analog!

7 Comments Leave A Comment
Science / Space Race

[June 6, 1961] America’s Answer to Lunik: Project Ranger

8 Comments


by Lawrence Klaes

[The Space Race continues to run at an ever-accelerating pace.  To keep up with all the new developments, I've tapped my friend and fellow professional space historian to tell us a very special program that just might score for the United States in the next inning…]

President Kennedy declared three weeks ago before Congress that America shall make the bold step of “sending a man to the Moon and returning him safely to the Earth” before the end of this decade.  This has given a much needed – and quite literal – boost to the American space program. 

It couldn’t have come at a better time.  Since that day in October of 1957 when our geopolitical and space rivals, the Union of Soviet Socialist Republics, or USSR for short, lofted that 184-pound silvery sphere they called Sputnik 1 into Earth orbit, the Communists have handily outpaced us on virtually all key fronts of the Space Race.  First animal in orbit.  First man in orbit.  First probe to Venus.  First victories in the race to that big golden prize in our night sky, the Moon.

In one year alone, 1959, the Soviets sent the first space probe flying past the Moon and on into solar orbit.  This was followed by the first manmade vehicle to impact another world, with their Luna 2 littering the lunar dust with pennants engraved with the Soviet Coat of Arms.  The USSR rounded out their lunar triumphs of 1959 with a circumlunar imaging mission that revealed the hitherto unseen lunar farside.

So which Superpower will be the first to orbit the Moon?  The first to land, with robots and then with manned spacecraft?  Experts in various fields might understandably side with the Soviet Union, including those in the West.  In a mission-by-mission comparison, America’s efforts at exploring and conquering the Moon pale.

All of the first three Air Force Pioneer lunar probes fell short of their celestial goal.  Of the next two, made to order by Jet Propulsion Laboratories in Pasadena, California (JPL), Pioneer 4 alone escaped the confines of Earth’s gravity and headed into interplanetary space in March 1959.  Unfortunately, the small conical craft was many thousands of miles too far away for its scientific instruments to examine the Moon and slipped on to join its Soviet counterpart, Luna 1, in solar orbit.

Then it was STL’s turn again with their advanced Atlas Able Pioneers.  All four of them failed.  Spectacularly.

And so, back to JPL.  They have a new robotic lunar exploration program that they are confident will return some of NASA’s prestige in space and ensure that one day soon the Stars and Stripes will be standing tall on the lunar surface — before the Hammer and Sickle.  Named Ranger, it is actually a three-step program of increasingly sophisticated species of spacecraft: what the space agency calls Blocks.

The two Block I machines will fly this year.  Looking like an oil rig with two long solar panel “wings” at its base and a large high-gain directional dish antenna beneath, the first two Rangers will initially enter an Earth parking orbit and gradually be moved farther out into space until well beyond the Moon.  There the controllers at JPL will put the probes through their paces to see how they handle the cislunar environment to improve upon the next blocks of Ranger missions.  These won’t just be engineering flights; each Block I Ranger it will also fly a suite of scientific instruments. 

Now, JPL thought these science Rangers were good enough to make good Venus probes, too.  Their intention was to launch these modified Rangers using the Atlas-Agena B combination of rockets. 

NASA rejected this plan, instead asking JPL to develop a more ambitious planetary probe labeled Mariner A, which would use an Atlas rocket with the powerful Liquid Oxygen Centaur second stage.  The Centaur booster has a more powerful payload lifting capability, which translates into sending their Mariner A concept with more scientific instruments to either Venus or Mars.

However, the Centaur has had a number of technical issues during its development.  There is genuine concern that the new booster will not be ready in time to send a probe to Venus during the 1962 launch window.  A delay would mean waiting for the next launch window over two years hence.  NASA officials and others are quite certain that the Soviets could have their own Venus probes on their way to the second world from the Sun by next year.  A successful exploration of that planet would bring yet another space victory and political glory to the communist nation.  Thus the Ranger bus option to flyby Venus and see what dwells under its mysterious bank of clouds remains a plausible alternative.

Back to the Moon: the first Block I Ranger is scheduled for launch from Cape Canaveral in Florida atop an Atlas-Agena B for late July, 1961.  Its sister probe, Ranger 2, will follow into space aboard a similar rocket sometime in October.

Ranger Block II will be the first Moon missions.  Scheduled for 1962, three probes will fly through the airless void to make a direct hit on the Moon.  The original proposal called simply for each Ranger to carry a TV camera to map potential landing sites.  But, just as nature abhors a vacuum, scientists abhor minimum missions.  Thus, some of the sky science experiments from Block I will make their way to Block II — over the protests of engineers, who abhor complication. 

The neatest bit is the MoonQuake detector.  It is hoped that the Rangers will not be completely destroyed at the end of their missions: Each probe carries atop its main bus a thick sphere of balsa wood.  At the very center of each ball is a seismometer which will determine if the Moon produces quakes just as they occur on Earth.  The balsa sphere will protect the sensitive geological instrument upon impact with the lunar surface.  Six silver cadmium batteries will power the seismometer for up to one month after the rough landing. 

Just as with earthquake science here on Earth, the Ranger 3 through 5 science packages should teach us much about the composition of the lunar interior and if the Moon is still geologically active or not.  Although most scientists now accept that the vast majority of lunar craters were caused by ancient meteor and comet impacts, it may be that some of them are actually the calderas of volcanoes.  Scientists want to know if any of them may still be active. 

Finally, we have Ranger Block III.  As with their predecessors, the robot probes of Block III will also be sent plunging into the Moon.  While these mechanical explorers will not survive their high-speed impacts with the lunar crust, they will nevertheless return thousands of increasingly detailed images of particular regions of the Moon in real time using a bank of onboard television cameras.  These images will help scientists understand the finer details of the lunar surface both for geology as well as assisting NASA with future locations for soft landing missions, including manned vessels.

The manned program that will benefit from the findings of the Ranger program is Project Apollo.  The space agency had already planned Apollo as a follow-up spacecraft to Mercury with goals including a circumlunar flight or even a lunar orbital mission.  With President Kennedy’s new mandate to place a man on the Moon by the end of this decade, NASA has already begun to expand Apollo to include the ability to land astronauts on the lunar surface.  Whether this will involve using the entire Apollo craft and the powerful Nova rocket currently on the drawing board or perhaps an alternate concept of a separate Apollo craft and lander will be decided after much study and debate.

One thing from all this is certain, though: The Soviet Union has clear ambitions for the ultimate high ground of space.  Should the Soviets come to dominate Earth orbit and our neighboring worlds, especially if they include nuclear arms in this mix, the American way of life will be under a greater threat than ever before since the end of the last World War and the start of the Cold War. 

8 Comments Leave A Comment
Science / Space Race

[May 6, 1961] Dreams into Reality (First American in Space)

4 Comments

I've been asked why it is that, as a reviewer of science fiction, I devote so much ink to the Space Race and other scientific non-fiction.  I find it interesting that fans of the first would not necessarily be interested in the second, and vice versa. 

There are three reasons non-fiction figures so prominently in this column:

1) I like non-fiction;
2) All the science fiction mags have a non-fiction column;
3) Science fiction without science fact is without context.

Let me expand on Point 3.  Science is different from all other philosophies because of its underpinning of reality.  My wife and I had this debate in graduate school many years ago with our fellow students.  They felt that, so long as their systems were logical, their views on how the universe worked were just as valid as any others – certainly more valid that lousy ol' science, with its dirty experiments and boring empiricism.

They're wrong, of course.  Religion and philosophy have discerned little about the natural universe except by accident or where the practitioners have utilized some version of the scientific method.  The fact is, there is a real universe out there, and it pushes back at our inquiries.  That "friction" is what allows us to experiment as to its nature.  It's why we have wonders like airplanes, nuclear power, the polio vaccine, the contraceptive pill. 

Similarly, science fiction is nowheresville without an underpinning of science.  Science fiction is not make believe – it is extrapolation of scientific trends.  Even fantasy makes use of science; ask Tolkien about his rigorous application of linguistics in his construction of Elvish.  It is important that my readers keep abreast of the latest science fact so they can better understand and appreciate the latest science fiction. 

And it goes both ways – the science of today is directly influenced and inspired by the dreams of yesterday.  Without science fiction, science is a passionless endeavor.  Jules Verne showed us space travel long before Nikita Khruschev. 

Thus ends the awfully long preface to today's article, which as anyone might guess, covers America's first manned space mission.  Yesterday morning, May 5, 1961, Commander Alan B. Shepard rocketed to a height of nearly 190 kilometers in the Mercury spacecraft he christened "Freedom 7."  His flight duplicated that of chimpanzee Ham's February trip: a sub-orbital jaunt that plopped him in the middle of the Atlantic Ocean.  He flew for just 15 minutes.

The flight was so short because Shepard's rocket, the same Redstone that launched the first American satellite into orbit, was simply too weak to push the two-ton Mercury fast enough to circle the Earth.  The Redstone is an old missile, made by the Army in the early '50s.  It is significantly weaker than the Soviet ICBM that hurled the first cosmonaut into space.  It looked embarrassingly undersized compared to the Mercury it carried – like a toy rocket.

We have a booster comparable to that which launched Vostok, the ICBM called Atlas, but it's not ready yet.  In fact, a test shot of the Atlas-Mercury combination (MA-3) failed miserably just last week on April 25, and before that, the Atlas failed in four out of four unmanned Moon missions.  It is likely that we won't see an American in orbit until 1962.

The flight of "Freedom 7" might have impressed more had it before occurred the Soviet orbital shot that made the headlines on April 12.  In fact, a Mercury-Redstone did go up on March 24, a full three weeks earlier.  It carried an unmanned boiler-plate Mercury capsule; the main purpose of the mission to make sure the Redstone was truly ready for a human passenger since it had been a little balky during Ham's flight.

The flight of "MR-BD" went perfectly.  Had MR-BD been a manned mission, Shepard would have been the first human in space. 

And so the Soviets scored yet another first in the Space Race.  But does it matter?  NASA is already soliciting designs for its "Apollo" series of Moon ships, scheduled to launch at the end of the decade.  The Russians announced a similar program on May Day.  If this is going to go on for the long haul, I prefer a measured, safety-conscious space program over a reckless one.  The tortoise beat the hare, and I predict Shepard's flight is just the first tentative step toward a permanent American presence in space.

The Mercury capsules are proven.  Our astronauts are proven.  All that's left is the Atlas.  Let's do things right the first time rather than repeat the failures of the Air Force's Discoverer program and the Soviet Vostok program.  I want all my astronauts back safe and sound; this is a marathon, not a sprint.

And at the end of it, all those space travel stories we've enjoyed for decades will at last become reality.  A triumph for science fiction and science.

4 Comments Leave A Comment
Science / Space Race

[April 28, 1961] Newies but goodies (April space round-up!)

4 Comments

They say "You're only as old as you feel," which explains why Asimov pinches co-eds at conventions.

I've been asked why someone of my advanced age is into the bop and rock and billy that the kids are into these days, when I should be preferring the likes of Glenn Miller or Caruso.  Truth be told, I do like the music of my youth, the swing of the 30s and the war years (no, I didn't serve.  I was 4F.  My brother, Lou, was in five Pacific invasions, though.) But there's something to today's music, something new.  Lou's kid, David, really turned me onto this stuff – the Cubano and the Rock n' Roll.  Music beyond whitebread and Lawrence Welk. 

It makes me feel…young.

I've got a full month of space news to catch up, in large part because I was remiss around the end of last month thanks to Wondercon.  And then Gagarin's flight eclipsed all else in significance for a while, but there is more to off-planet exploration than men in capsules.

Like dogs in capsules.  Gagarin's flight was preceded by Sputnik 10, launched March 25.  In retrospect, it is clear that it was a test flight of the Vostok spacecraft, and it carried a mannequin cosmonaut and a dog, Zvezdocha ("Little star" – a charming name).  Both passengers returned safely to Earth. 

The fact that Sputnik 9, Sputnik 10, and Vostok 1 all launched in such close succession is a testament to the robustness of the Soviet space program.  It is clear that they have plenty of boosters and capsules to fling into space.  One has to wonder if their second manned space shot will precede our first (currently scheduled for May 4.)

Also launched March 25 was the diminutive and short-lived Explorer 10.  Its brief lifespan was intentional.  The little probe was sent on a eccentric orbit that took it nearly half-way to the Moon.  For just 52 hours, the craft returned data on the magnetic fields in cislunar space, well above the energetic Van Allen Belts.  It may seem a waste to send a satellite up for such a short time, but solar panels are heavy, and the Thor Delta that boosted it can only throw so much into space. 

Some of the results are straightforward — it confirmed the speed and density of solar flare protons.  As for the magnetospheric results, well, their interpretation depends on the answer to one question: did Explorer 10 probe into a realm beyond Earth's magnetic field (thus measuring the sun's field) or just its outer reaches? 

Columbus' first trip returned inconclusive results about the New World; so it will take several more satellites to properly map the high electromagnetic frontier.

Speaking of seeing the unknown, many humans (yours truly included) have some degree of color-blindness.  That is, there are wavelengths of the visual electromagnetic spectrum that we cannot distinguish from others.  For all intents and purposes, those colors don't exist to us. 

All humans are subject to another kind of color-blindness, one caused by the atmosphere.  You see, while the sky seems perfectly clear to us, at least at night, in fact the air blocks a good many wavelengths of light that we'd be able to detect if it weren't there.  Not with our eyes, to be sure, but with equipment. 

X-Rays, for instance.  High-flying sounding rockets have found tantalizing evidence that the Sun emits those high energy waves.  Explorer 7's and Vanguard 3's X-Ray detectors were swamped by the radiation of the Van Allen Belts.  Solrad, equipped with a magnetic sweeper, was humanity's first eye in the sky that could see light in that spectrum, though only in a crude fashion, counting the photons as they struck its photocell.  Perhaps the upcoming Orbital Solar Observatory will see more.

Even more elusive are the extremely energetic gamma rays, normally only detected as radiation from natural and artificial nuclear reactions.  Logic would suggest that these rays are emitted by stars, but there is no way to be sure from the ground.

Enter Explorer 11, launched on one of the last Juno II rockets (thankfully, it worked; these neglected boosters have a mere 50/50 chance of success.) It looks to my eye like the early Explorers, which makes sense: the body of the probe is the little Sergeant rocket that makes up the fourth stage of both the Juno I and II.  This little guy is the first satellite that can detect light in the gamma ray end of the spectrum.  Again, it isn't a camera, but it will detect the number and direction of the rays that hit its sensors.  Who knows just what it will find!

4 Comments Leave A Comment
Science / Space Race

[February 1, 1961] Fur and Film (Mercury Redstone 2 and Samos 2)

It's hardly kosher, but it's certainly good news: yesterday, a Redstone rocket launched the first piloted Mercury capsule on a 15-minute flight into space.  No, we didn't put a man in orbit–we sent a three-year old chimpanzee named Ham on a vertical jaunt over the West Atlantic. 

It wasn't a perfect mission by any means.  The rocket fired too hard and too long, subjecting the little pilot to extra "Gs".  Also, the rocket-powered escape tower was triggered about five seconds from main-booster burnount, and poor Ham and his ship were dragged a thousand feet from their Redstone.  These issues are troubling and may result in another test mission before the all-up effort.  On the other hand, they also show that the sturdy capsule can "take a licking and keep on ticking."  The pilot was sturdy too despite the rigors of the journey, Ham dutifully ran through his in-flight routine, flipping switches and levers for the duration of the 15-minute flight.

In other news, the Air Force finally got its "official" spy satellite into orbit.  Samos is the successor to the utterly, completely, unquestionably solely scientific series, "Discoverer", which sent back capsules from space that may or may not have had photographs of the Soviet landscape in them.  Samos 2 (the first one was a dud) was launched into a polar orbit, like Discoverer.  It might also send back film, but its main purpose (I am given to understand) is to broadcast real-time photography from space without having to return film to Earth.  Instead, the pictures are photo-statted in space and then 'faxed down to Earth.  I wondered why the satellite didn't use a TV system, like the weather satellite, TIROS, but I imagine the resolution would be too poor to be useful.  I have also heard some accounts that Samos 2 is testing out an ELINT (Electronic INTelligence) system that will allow us to locate and evaluate Soviet radar systems.  It's hard to get a consistent report on the matter–the Air Force is clamming up on its programs these days.

So there you have it: the civilians are sending up sounding apes, and the missilemen are orbiting eyes in the sky.  No matter how you slice it, 1961 is already an interesting year in Space.

Leave A Comment