Launch of the Hubble Telescope
On April 24, 1990, NASA launched the Hubble Telescope from the Space Shuttle Discovery.
German scientist Hermann Oberth, one of the founders of rocketry, was the first person to suggest sending a telescope into space aboard a rocket in 1923. Little was done over the next 20 years until astrophysicist Lyman Spitzer, Jr., wrote a paper suggesting a space observatory. While progress was slow, Spitzer continued promoting the idea for the next 50 years.