STS-114 Post-Flight Presentation

Persistent problems with a seismometer instrument package will keep NASA’s InSight Mars lander from departing for the red planet during a March launch period, and officials said they will consider shelving the $675 million project if the issues prove too costly to fix.

VIDEO: After a cliff-hangar countdown, Atlantis thunders to life and majestically rockets into history, putting on one last sky show for spectators on NASA’s 135th and final shuttle launch on July 7, 2011. (Membership Required)

SpaceX’s launch of the Starlink 6-56 mission will move the company past the total number of Space Shuttle Program missions from Launch Complex 39A. Liftoff is set for 2:42 p.m. EDT (1842 UTC).