University of Colorado Boulder alum Sarah Gillis returned to Boulder on Monday after a space mission where she participated in the first-ever commercial spacewalk and became the first person to play a ...

SpaceX astronaut Jared Isaacman said frequent space travel is "around the corner." How humans will survive off-world is ...

Severe geomagnetic storm sparks stunning northern lights across US (photos) In this photo ... Polaris Dawn mission commander, and Sarah Gillis, mission specialist, took turns testing the mobility ...

Astronaut and University of Colorado Boulder alum Sarah Gillis will speak at CU Boulder from 3:30 to 5 p.m. Monday at Fiske Planetarium, 2414 Regent Drive. Gillis flew to space this summer and ...

Big Brother star Sarah Griffiths has addressed her "stop the gloats" controversy, admitting she feels "so awful" about it. During an episode last week, the newly-evicted housemate was heard chanting ...

Coldplay's Chris Martin puts on a colorful show in New Zealand, plus Ariana Grande, Elizabeth Olsen and more. From Hollywood ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Three of the ...

Space can be a wondrous place, and we've got the pictures to prove it! Take a look at our favorite space pictures here, and if you're wondering what happened to today in space history don't miss ...