Add Yahoo as a preferred source to see more of our stories on Google. Right above you is the sky – or as scientists would call it, the atmosphere. It extends about 20 miles (32 kilometers) above the ...

NASA unveiled a new telescope on Tuesday to scan vast swathes of the universe for planets outside our solar system and probe ...

Space holds terrifying secrets, with black holes standing out as unfathomable cosmic entities. These celestial objects ...

Get a first look at the completed observatory.