An international crew is readying for Thursday's planned launch of a NASA mission to the International Space Station after arriving at the Kennedy Space Center.

The launch takes place on a milestone date, marking 20 years since the STS-114 space shuttle mission took off from Kennedy Space Center Pad 39B. The launch of Discovery on the STS-114 mission on July 26, 2005, marked the return to flight for the space shuttle after the Columbia tragedy investigation.

The next four people to launch to the International Space Station have arrived at their launch site.