On January 10, 1946, the U.S. army bounced radar signals off of Earth’s moon for the first time ever. Known as “Project Diana,” this was the first experiment in radio astronomy. See how it happened in our On This Day In Space video series!
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- On This Day in Space! ISS Astronauts Toss ‘SuitSat’ Overboard
- See the Whirlpool Galaxy Through the Eyes of the NASA’s ‘Great Observatories’
- This Is the Purest Beam of Light in the World
- Hyperfast Shock Waves from a Supernova Heat Atoms to Blazing-Hot Temperatures