Hubble Space Telescope: Pictures, Facts & History

Life on Mars: Exploration & Evidence

How Far Away is Mars? | Distance to Mars

Rocket Lab to Attempt Second Test Launch: How to Watch

Images: Discovery of 8th Planet in Kepler-90 System with Google AI

Interstellar Visitor Stays Silent: No Signs of Life Yet on 'Oumuamua

Blue Origin's Test Flight This Week Included Medical Tech, Student Experiments

Record Breaker! 8th Alien Planet Found Around Distant Star

'Outshone Everything in the Universe': Scientist Talks Gravitational Waves in NYC

Astronauts Will Watch 'Star Wars: The Last Jedi' in Space!

'Stargate' Prequel Series Finishes Filming: Check Out This Sneak Peek

Image of the Day

See the Next Generation of Nuclear Power for Mars Missions (Video)

Dwarf Planet Ceres' Bright Spots Suggest an Ancient Ocean

Lego UCS Millennium Falcon: Building the Fastest Hunk of Bricks in the Galaxy

The Greatest Star Wars Villains Ever

Holiday Miracle? Israeli Moon-Race Team Needs $7.5 Million by Dec. 20

Soyuz Crew Returns to Earth Safely After 139 Days on Space Station

Best Astronomy and Astrophysics Books

Best Space Books and Sci-Fi: A Reading List