US
Experts pointed to two once-pristine sites that have become worryingly cluttered since the space age dawned in 1957
J025, discovered in May 2014, will be the largest asteroid to come this near to the planet since 2004
The unmanned cargo ship is packed with food and supplies for the astronauts living at the International Space Station
NASA's Office of Inspector General cited technical as well as budget challenges
Your little slice of Earth would be an average 55 miles wide
An ice-encrusted moon orbiting Saturn appears to have the conditions necessary for life
'Touchdown confirmed,' said a commentator on Nasa television broadcasting the landing
Scientists hope to learn if the rings are as old as Saturn itself
NASA will work toward the goal of a crewed mission to Mars in the 2030s
The spacecraft was found orbiting the moon