University of Colorado at Boulder alumnus Jim Voss is slated to make his fourth journey into the heavens on Friday, May 19, when NASA's space shuttle Atlantis blasts off from Cape Kennedy, Fla. Originally slated for launch April 16, the flight has been delayed three times. Carrying a seven-person crew, Atlantis is scheduled to dock with the International Space Station to unload a ton of cargo and perform maintenance on the orbiting habitat as its assembly continues, said NASA officials. Launch is slated for 4:12 a.m. MDT.