A view of Earth from STS-94, in July of 1997. This mission was unique in that it used the exact same crew (and the same payload) as the earlier STS-83, the only time this has been done in the history of space travel.

A view of Earth from STS-94, in July of 1997. This mission was unique in that it used the exact same crew (and the same payload) as the earlier STS-83, the only time this has been done in the history of space travel.