Astronomy Picture of the Day

Explanation: On April 12, 1981, twenty years ago today, the Space Shuttle Columbia became the first shuttle to orbit the Earth. In this gorgeous time exposure, flood lights play on the Columbia and service structures (left) as it rests atop Complex 39's Pad A at Kennedy Space Center in preparation for first launch. Flown by Commander John W. Young and Pilot Robert L. Crippen, Colombia spent 2 days aloft on its check-out mission, STS-1, which ended in a smooth landing, airplane-style, at Edwards Air Force Base in California. Ferried back to Kennedy atop a modified Boeing 747, Colombia was launched again seven months later on STS-2, becoming the first piloted reuseable spacecraft. The oldest operating shuttle, Columbia's 1981 debut was followed in 1982 by shuttles Challenger (destroyed in 1986), Discovery in 1983, Atlantis in 1985, and Challenger's replacement Endeavour in 1991. This shuttle fleet has now accomplished over 100 orbital missions. Today also marks the 40th anniversary of the first human in space, Yuri Gagarin.