NASA astronauts aboard SpaceX capsule heading to a splashdown in the Gulf Of Mexico

It will be the first landing ever by astronauts in the gulf, according to Jonathan McDowell, astronomer at the Harvard-Smithsonian Center for Astrophysics. If all goes well, the crew would undock from the station at about 7:34 p.m. Saturday and splash down Sunday at 2:42 p.m.