A new propulsion system feeds the same "monopropellant" fuel into electrical and chemical thrusters, potentially saving on mass and complications for future missions to Mars.

Above a certain threshold, galaxies stop growing , no matter how much raw material they have on hand. The question is: what flips the switch?

NASA named the astronauts who will launch on its Artemis 3 mission next year to test docking procedures in Earth orbit ahead of a planned moon landing in 2028.

Set your alarm for June 10 as Saturn shines beside a bright crescent moon in the predawn sky.

"It replaces expertise with political appointees, globally decouples the U.S. and completely guts our scientific ecosystem."

NASA astronaut Jessica Meir captured a breathtaking view of auroras on Earth from orbit while sheltering with her fellow astronauts in a SpaceX Dragon spacecraft.

The director of 'Close Encounters' and 'ET', an original story, 'X-Files'-style conspiracy theories… 'Disclosure Day' is a welcome escape from the mega-franchises.

As Steven Spielberg's alien conspiracy thriller "Disclosure Day" heads to theaters, Space.com talks to the astronomer who has led efforts to make sure any real alien detection will not be kept a secret.

The livestream begins at 3:30 p.m. (1930 GMT) on June 9.

Scientists have proposed a spacecraft-based system to actively strengthen Earth's magnetic shield and reduce the impact of powerful solar storms.