NASA's Cassini mission has come to a spectacular close on September 15. The spacecraft has been orbiting Saturn and studying that system for 13 years.
A technical glitch has caused SpaceX to delay the first commercial flight of a new rocket as it was about to blast off. The rocket needs to complete seven successful flights before it can transport astronauts for NASA.
With the new experiment, the US space agency wants to research how human sperm cells react to microgravity — and whether humans could procreate in space. Other mammals have had little success so far.
German astronaut Alexander Gerst is returning to the ISS as commander in June. Today he is giving his last press conference before the flight. As the first-ever German ISS commander, what exactly will he have to do?
Tess rode a SpaceX Falcon rocket as it embarked on a quest to find new planets around neighboring stars that could support life. The washing machine-sized telescope will scan almost the entire sky for at least two years.
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