Spacewalking astronauts repaired and upgraded the famed Hubble Telescope during five missions from 1993 to 2009. Here's a summary of these epic servicing efforts.

Check out this fun way to embrace Earth Day and NASA's 60 years of planetary observation.

A new microscope just arrived at the International Space Station to help study life's adaptability under extreme conditions using an innovative imaging technique.

Scientists have long known that Saturn's largest moon, Titan, hosts rivers and seas of liquid methane. But it's strangely lacking in river deltas, a new study suggests.

NASA engineers tested the functionality of Orion's forward bay cover, which is the last component of the spacecraft that must be ejected before parachutes deploy to land.