October 18, 2017, 7:25 p.m. by Bryan Nelson
The cavern is large enough to house a city at least the size of Philadelphia.
How to see Orionid meteor shower at its peak
October 18, 2017, 10:54 a.m. by Joe Rao, SPACE.com
The best time to watch is around 1 a.m. or 2 a.m. local time, when you'll see bright meteors streaking through the sky.
Scott Kelly's new memoir takes the romance out of living in space
October 16, 2017, 3:21 p.m. by Michael d'Estries
Astronaut lays bare the highs and lows of living through NASA's longest single spaceflight.
Water ice might exist along Mars' equator, and scientists don't know how it got there
October 3, 2017, 1:24 p.m. by Bryan Nelson
The finding could change everything we thought we knew about the red planet, and make colonization feasible.
5 reasons why the James Webb Space Telescope is such a big deal
September 29, 2017, 10:45 a.m. by Gerri Miller
The highly anticipated successor to the Hubble Space Telescope is scheduled to launch in spring 2019.
Fourth set of gravitational waves detected rippling past Earth
September 28, 2017, 10:25 a.m. by Bryan Nelson
What these waves in the fabric of spacetime can tell us about other dimensions, black holes and gravity.