Whatever name it sailed under — International Sun-Earth Explorer 3, and International Cometary Explorer, among others — this spacecraft has scored a number of firsts over the years, including the first comet flyby. NASA Goddard Spaceflight Center hide caption

itoggle caption NASA Goddard Spaceflight Center

Astronomers thought they saw a big explosion in the nearby Andromeda galaxy. GALEX, JPL-Caltech/ NASA hide caption

itoggle caption GALEX, JPL-Caltech/ NASA

"The scairest thing I've done is ride a rocket ship to space" — Chris Hadfield James Duncan Davidson/TED hide caption

itoggle caption James Duncan Davidson/TED

The Holmdel Horn Antenna at Bell Telephone Laboratories in New Jersey was built in 1959 to make the first phone call via satellite. NASA hide caption

itoggle caption NASA

NASA Administrator Charles Bolden speaks during a news conference in Berlin on Monday. Bolden said no single country was indispensable to the International Space Station's success. Michael Sohn/AP hide caption

itoggle caption Michael Sohn/AP

An image shot by NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Aqua satellite on Wednesday. It shows multiple wildfires in Calif. trailing smoke into the Pacific Ocean. Lynn Jenner/NASA/Goddard hide caption

itoggle caption Lynn Jenner/NASA/Goddard