Shuttle Atlantis unwrapped ahead of public debut

SpaceX will go for another first Thursday, this time flying a refurbished Dragon supply ship carrying nearly 6,000 pounds of cargo and experiments to the International Space Station nearly three years after its first mission.

A NASA video on the investigation into the Challenger accident of January 28, 1986. The video was created by the STS 51-L Data and Design Analysis Task Force which contributed to the Presidential Commission that investigated the tragedy. (Membership required)

A Falcon 9 rocket is being readied for a space station resupply mission at Kennedy Space Center’s launch pad 39A . The rocket is scheduled to launch at 10:01 a.m. EST (1501 GMT) on Saturday, weather permitting. Watch live coverage.