The Habitable Worlds Observatory is poised to tell us whether Earthlike planets are common—if it can get off the ground ...

NASA and Sierra Space updated a previous deal that shifts Dream Chaser’s first mission to a free flight test before potential ISS cargo runs.

Sierra Space's Dream Chaser spaceplane is facing an identity crisis after NASA changed contract terms to remove its guarantee to buy cargo flights to the ISS.

It's another example of NASA relying more on private enterprise for its orbital infrastructure and maintenance.

NASA has released the first radar images from a new Earth-mapping satellite showing the Maine coast and Minnesota farmland in incredible detail. The pictures are from a spacecraft that rocketed ...