A second Earth has been spotted by NASA scientists but it is 40 light years away
The exoplanet, called "Gliese 12b", is slightly smaller than Earth and could be habitable
Which animals will be the first to live on the moon and Mars?
Spaceborne animals could help humans survive on the moon or Mars. But which creatures would be the best for astronauts?
World’s first commercial spaceplane in final stages before debut ISS flight (video)
The Dream Chaser has been in development since its announcement in September 2004, and was initially set to be part of NASA's Commercial Crew program, shuttling astronauts to the ISS and back