A Day in Astronomy: Launch of the Galex Space Telescope

Image (Credit): Artist’s rendering of the GALEX space telescope orbiting Earth. (NASA/JPL-Caltech)

On this day in 2003, NASA air-launched the Galaxy Evolution Explorer (GALEX) via a Pegasus launch vehicle. It was an active orbiting space telescope for the next nine years, observing the universe in ultraviolet wavelengths to learn more about star formation in the universe.

Some of the highlights of the GALEX mission include:

  • Discovering a gargantuan, comet-like tail behind a speeding star called Mira;
  • Catching a black hole “red-handed” as it munched on a star;
  • Finding giant rings of new stars around old, dead galaxies;
  • Independently confirming the nature of dark energy; and
  • Discovering a missing link in galaxy evolution — the teenage galaxies transitioning from young to old.

A Day in Astronomy: First Liquid-Propellant Rocket

Image (Credit): Robert Goddard with his rocket on March 8, 1926 before a failed launch. He was able to successfully launch it on March 16th. (Smithsonian Air & Space Museum)

On this day in 1926, Robert Goddard launched the world’s first liquid-propellant rocket in Worcester, Massachusetts. The rocket climbed to about 41 feet and traveled a distance of only 184 feet, but it was a success. After that, he kept the results under his hat for almost a decade.

Although in fragile health as a young man, Goddard pursued ideas in science, watched the heavens with his telescope, and became a fan of the writings of H.G. Wells, particularly The War of the Worlds. He also survived a bad case of tuberculosis at age 31, but he fought his way back to his scientific work.

Robert Goddard had a productive, yet at times frustrating, academic career involving rocketry, at times dabbling with potential military projects as well. For example, during the World War I period he came up with the idea of a hand-held tube-based rocket launcher that would later become the bazooka. However, the U.S. military was slow to show interest in larger rockets until the Germans leaped ahead in the 1940s, which the Germans did by building on Goddard’s work. It did not help that Goddard was very protective of his ideas and did not always work well with others, in part due to some early criticism.

In a 1932 letter to writer H.G. Wells, Robert Goddard stated:

How many more years I shall be able to work on the problem I do not know; I hope, as long as I live. There can be no thought of finishing, for ‘aiming at the stars’ both literally and figuratively, is a problem to occupy generations, so that no matter how much progress one makes, there is always the thrill of just beginning.

He was right. One hundred years later we are continuing his work as we aim for the Moon, Mars, and eventually the stars.

You can read more about this early rocket flight at this Smithsonian site.

A Day in Astronomy: The Death of Eugène Michel Antoniadi

Image (Credit): E.M. Antoniadi’s 1930 book La Planete Mars. (Linda Hall Library)

On this day in 1944, Greek-French astronomer Eugène Michel Antoniadi passed away in Paris, France.

Mr. Antoniadi was one of the astronomers that battled the idea of a civilization creating canals on the surface of Mars, putting him at odds with American astronomer Percival Lowell. While he was initially open to the idea, he later believed the canals to be an optical illusion.

You can learn much more about the Martian controversy in David Baron’s book The Martians: The True Story of an Alien Craze that Captured Turn-of-the-Century America. You can also hear an interview with the author on the Planetary Society’s Planetary Radio podcast.

Credit: Liveright Publishing

A Day in Astronomy: The Last Word from Pioneer 10

Image (Credit): The visual message on the Pioneer 10 and 11 plaques. (NASA Ames)

On this day in 2003, NASA heard its last message from Pioneer 10, the Jupiter space probe. Launched in 1972, it was the first spacecraft to cross the asteroid belt between Mars and Jupiter on its way to the outer planets. It is also one of only five spacecraft to leave our solar system.

Both Pioneer 10 and 11 carried specially designed metal plaques that explained the position of the Earth as well as the nature of human beings. Carl Sagan helped with the design of these unique plaques.

If all goes well, in about 2 million years the Pioneer 10 spacecraft will encounter the star Aldebaran. Maybe some civilization in that solar system will be arguing about this object floating through the neighborhood the way we have argued about the origins of the interstellar object we call 3I/ATLAS.

Image (Credit): Mission patch for Pioneer 10 and 11. (NASA)

A Day in Astronomy: Death of Hermann Oberth

Image (Credit): Hermann Julius Oberth. (European Space Agency)

On this day in 1989, rocket pioneer Hermann Julius Oberth died. He was born in Austria-Hungary in 1894 and at a young age was inspired by the rockets in the fictional stories by Jules Verne, such as From the Earth to the Moon.

Oberth’s interest in the stories of Verne led him to build his first rocket at the age of 14. His doctoral dissertation was on rocketry, he wrote books on rocketry, and he later joined an amateur rocketry group called the “Spaceflight Society” where he mentored other rocket enthusiasts, including Wernher von Braun.

Oberth was unable to get a security clearance to work on the Nazis V-2 rocket, thereby limiting his value to Americans following World War II, unlike Wernher von Braun and others who came to the United States under Project Paperclip and later assisted with NASA’s Apollo program.

Wernher von Braun was still able to get Oberth a position with the U.S. Army after the war and paid tribute to his mentor by stating:

I have a boundless admiration for the solitary genius which enabled him to bring into focus all of the essential elements of a gigantic concept, together with the human greatness which allowed him, in shy reserve, to bear with equanimity the “crucify him” as well as the “hosannas” of public opinion. I myself owe him a debt of gratitude not only for being the guiding light of my life but also for my first contact with the theoretical and practical aspects of rocket technology and space travel.

Oberth continues to be known today as the “Father of Space Travel.”