The second Mercury mission was going according to plan until the Liberty Bell 7 capsule sank in the ocean. NASA exonerated astronaut Gus Grissom, and two researchers now say they know what happened.
The three astronauts who blasted off Thursday from the Jiuquan launch center in northwestern China will stay three months in the Tianhe, or Heavenly Harmony.
Four astronauts are set to launch to the space station Friday. When they arrive, the new crew of 11 will be the largest since the shuttle program, and there aren't enough sleeping pods for them all.
An experiment involving some "mighty mice" on the International Space Station could someday help astronauts maintain muscle and bone strength on interplanetary journeys.