NASA's most heavily traveled spacecraft, the shuttle Discovery, is to launch Thursday on its final mission after a storied, 27-year career that has broken ground in many ways.

Here are some facts about the shuttle and some of its most memorable moments.

– First mission, STS-41D, was on August 30, 1984.

– Has completed 38 missions, and logged more than 5,600 trips around Earth.

– Traveled a total of 142,917,535 miles (230,003,477 kilometers) so far, will add 4.5 million miles (7.2 million kilometers) on this final trip.

– Spent 352 days in space until now, for a total of 363 days by the end of this mission.

– Carried the Hubble space telescope into orbit in April, 1990.

– Has twice been the first shuttle to return to orbit after a major disaster: in 1988 after Challenger exploded in 1986; and again in 2005 after Columbia disintegrated in 2003.

– Is the oldest shuttle in the three-member fleet, due to the demise of Columbia and Challenger which were older.

– Was the first shuttle to be piloted by a woman, Eileen Collins in 1995.

– First shuttle to be commanded by a woman, also Eileen Collins in 1999.

– Carried the first African-American astronaut spacewalker, Bernard Harris in 1995.

– Transported first sitting member of Congress in space, Senator Jake Garn in 1985.

– Delivered part of Japan's Kibo laboratory to the ISS in 2008.

– Was the first shuttle to rendez-vous with the Russian Mir Space Station 1995.

– Has received 99 upgrades.

– By the end of this mission, will have transported 180 people in total.

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