<human>:  What is the largest spacecraft ever built?
<bot>: The largest spacecraft ever built was the Space Shuttle. The Space Shuttle was a reusable spacecraft used to launch satellites into orbit and carry astronauts to low Earth orbit. The Space Shuttle had three main parts: the orbiter, the external tank, and the solid rocket boosters. The first Space Shuttle was launched in 1981 and the last was launched in 2011.