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	Scientists are particularly interested in Saturn's moon Titan because it's one of the few known moons with its own dense atmosphere. Titan's atmosphere is also thought to be very similar to what Earth's atmosphere was a long time ago. By learning about Titan, we'll learn about our own planet.

This site is no longer maintained. It contains historical data.

For current information about the NASA Astrobiology Program, please visit http://astrobiology.nasa.gov/

2006-07-17 | MISSIONS
Discovery Lands in Florida

The STS-121 astronauts returned home today from a successful mission to the International Space Station when Space Shuttle Discovery touched down at Kennedy Space Center, Fla. Landing occurred at 9:14 a.m. EDT. STS-121 was the 115th shuttle mission and the 18th to visit the space station. Also, landing marked the end of Discovery's 32nd flight.

NASA's Space Shuttle fleet has played an important role in astrobiology research at NASA. Many experiments concerning the response of terrestrial life to conditions in space have been conducted aboard the Space Shuttles. The Shuttles are also a primary means of transporting astronauts to and from the International Space Station. Human missions aboard the International Space Station can tell scientists a great deal about the future of life on Earth and beyond.

More on this story Full text of original item from NASA, Jul 17, 2006

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