Partner Series

Welcome to "On This Day ... in Space!" where we peer back in our archives to find historic moments in spaceflight and astronomy. So enjoy a blast from the past with's Hanneke Weitering to look back at what happened on this day in space!

On April 25, 1990, the Hubble Space Telescope was deployed!

Hubble is famous for taking some of the most amazing deep-space photos ever. It hitched a ride to space on the space shuttle Discovery with mission STS-31. Also on board were astronauts Charles Bolden, Loren Shriver, Bruce McCandless, Steven Hawley and Kathryn Sullivan.

The Most Amazing Hubble Space Telescope Discoveries

The crew used a Canadian-built robotic arm to deploy Hubble from the shuttle's cargo bay while they were orbiting 332 nautical miles above the Earth. No one knew it at the time, but Hubble wouldn't be taking any pretty pictures anytime soon. When Hubble took its first photos almost a month after it was deployed, the pictures were out of focus because of a flaw in its mirror. Thankfully, the problem was fixable, and astronauts successfully repaired it in 1993.

Celestial Photos: Hubble Space Telescope's Latest Cosmic Views

The Hubble Space Telescope recently celebrated its 28th birthday in orbit and continues to be an iconic observatory for astronomers and the public.

Catch up on our entire "On This Day In Space" series on YouTube with the playlist here.

Email Hanneke Weitering at or follow her @hannekescience. Follow us @SpacedotcomFacebook and Google+