On this day in 1972, the Apollo 17 crew on their way to the Moon took a photograph of the Earth that became known as “The Blue Marble” (shown above). You can see Africa, the Middle East, and Antarctica. It remains one of the most popular images of the Earth.
The Orion spacecraft caught its own image of the Earth earlier in Artemis I mission (shown below). It is more of a black and white marble. We can expect to see many more images of the Earth in the years to come as the Artemis missions continue.
Image (Credit): View of the Earth from the Orion spacecraft on November 17, 2022. (NASA)
Image (Credit): Astrobiologist Carl Sagan. (Nautilus.us)
On this day in 1934, scientist and communicator Carl Edward Sagan was born in Brooklyn, NY. He was to become a great communicator of all things related to astronomy. He has played a key role over the years introducing millions to our place in the universe through his books, television series, speeches, and scientific work. His television series Cosmos was a milestone in educational television, bringing the stars and planets into everyone’s living room, while his books (Contact, Pale Blue Dot, The Dragons of Eden) continue to encourage the next generation of astronomers.
Dr. Sagan has a long resume, but I am most fascinated with his work to communicate with extraterrestrial life. He was a strong supporter of the Search for Extra-Terrestrial Intelligence (SETI) and worked with NASA to ensure our spacecraft were equipped with a record of human activity to educate other planetary civilizations, including the gold records placed on the Pioneer 10 and 11 space probes as well as the two Voyager space probes.
Years ago, the Smithsonian magazine had a good summary of Dr. Sagan’s life in the article “Why Carl Sagan is Truly Irreplaceable.” I recommend the article as a good way to get to know the man, though delving into his books is even better.
Credit: Ballantine Books
Extra: Carl Sagan was also the founder and first president of the Planetary Society. Visit this Planetary Society site, Ann Druyan wishes you a happy Sagan Day, for more on Dr. Sagan’s work.
Image (Credit): Asteroid Gaspra in the asteroid belt, visited by the Galileo spacecraft on its way to Jupiter. (NASA/JPL/USGS)
On this day in 1991, NASA’s Galileo spacecraft flew by asteroid Gaspra, which is located in the asteroid belt between Mars and Jupiter. Galileo conducted a quick fly-by while flying towards Jupiter and its moons. The spacecraft also visited the asteroid Ida.
Asteroid Gasprawas first discovered back in 1916 by Russian astronomer G. N. Neujmin, who decided to name it after the Black Sea retreat of Gaspra, a Ukrainian spa town currently occupied by the Russians.
Here is some additional information from NASA about the asteroid, which has similar features to the asteroids now serving as moons to Mars (Phobos and Deimos):
A striking feature of Gaspra’s surface is the abundance of small craters. More than 600 craters, 100-500 meters (330-1650 feet) in diameter are visible here. The number of such small craters compared to larger ones is much greater for Gaspra than for previously studied bodies of comparable size such as the satellites of Mars. Gaspra’s very irregular shape suggests that the asteroid was derived from a larger body by nearly catastrophic collisions. Consistent with such a history is the prominence of groove-like linear features, believed to be related to fractures. These linear depressions, 100-300 meters wide and tens of meters deep, are in two crossing groups with slightly different morphology, one group wider and more pitted than the other. Grooves had previously been seen only on Mars’s moon Phobos, but were predicted for asteroids as well.
You car read more about the overall Galileo mission here.
Image (Credit): Artist’s rendering of the Galileo spacecraft arriving at Jupiter. (NASA)
On this day in 1946, we saw the Earth from space for the first time in history, and the sub-orbital motion pictures were captured by a V-2 rocket, a deadly German weapon that was finally put to good use. The U.S. launched the missile from the White Sands Missile Range in New Mexico. The rocket went as high as 65 miles, providing the best view of Earth up to that point. You can watch a short film on YouTube about the space trip here.
If you want learn more about the man who created the V-2 rocket for the Nazis, Wernher von Braun, then I recommend you check out Moonrise, a podcast I highlighted in an earlier post.
While the V-2 was a useful step into the space age, it was less useful as a weapon to the Germans. More people died making the rocket than died as a result of being a target of it. But today, the V-2 is both the source of space exploration as well as intercontinental ballistic missiles that could end humanity once and for all.
Image (Credit): Artist’s rendering of the orbiting Sputnik 1. (thegravitywell.org/)
On this day in 1957, the Soviet Union launched Sputnik 1, humanity’s first artificial satellite, setting of a space race that continues to this day. The U.S. National Archives has a copy of minutes from an October 9 meeting between President Eisenhower and his advisors to discuss Sputnik I. The text accompanying the minutes demonstrates the shock this event caused:
At first, some in the Eisenhower administration downplayed the satellite as a “useless hunk of iron.” As David Halberstam wrote in The Fifties, “The success of Sputnik seemed to herald a kind of technological Pearl Harbor, which was exactly what Edward Teller said it was.” Others in America and around the world saw Sputnik as an ominous leap ahead in prestige and military ability, whether or not the new missiles could actually hit a target with nuclear weapons. President Eisenhower and some of his advisors, when they realized the significance of the Soviet achievement, met to discuss the alarming developments.
Of course, Russia is more of a wounded bear at the moment while China tries to take the lead in the latest space race. This is not to diminish what the Soviet Union accomplished in the last century, nor what Russia can accomplish tomorrow if it put its energy into science rather than war.
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