Scientists may finally know why Venus, Earth's twin, lacks a moon, finding that the hottest planet in the solar system may have consumed its own natural satellite.

Stoke Space announced a $1 billion round of funding to support development of its fully reusable Nova rockets, including the newly revealed Nova Block 2, which will be capable of delivering 15-ton payloads to low Earth orbit.

"To explore strange new worlds; to seek out new life and new civilizations; to boldly go where no one has gone before!"

Astrophotographer Kevin Boardman spent more than 16 hours capturing the intricate filaments of the Crescent Nebula.

On Sept. 8, 2004, NASA's Genesis spacecraft crash-landed in Utah after its parachutes failed to deploy. Here's why it mattered.