Credit rating agency Fitch puts U.S. AAA rating on watch. Here's what that means.

An Essential Element For Life on Earth Has Finally Been Found on a Comet

Our Sun May Have Been Born With a Trouble-Making Twin Called 'Nemesis'AI-Powered information operations and new citizenship

Scientists Say We Should Rethink Moons as Planets… And Reinstate PlutoNASA's Next-Generation Asteroid Impact Monitoring System Just Got Switched OnRobot artist gets its first major exhibition — but is it truly creative?

'Alien World' Found in Giant Star System Challenges Our Thinking on Planet Formation"Inventing Anna": Rachel Williams suing Netflix for how she was portrayed in show about fake heiress Anna Sorokin

Bollywood movies continue to associate beauty with fair skin, AI study finds

Scientists Said These Stars Were Too Small to Exist, But We Finally Know Their SecretAlien Crystals Unlike Any Found on Earth Might Encrust The Edges of Titan's Lakes

SpaceX's About to Try Its 'Most Difficult Launch Ever'. Watch It Live HereThe First Frozen Sperm Samples Exposed to Microgravity Have Survived

NASA's About to Send an Atomic Clock Into Orbit, And It'll Revolutionise Space TravelCuriosity Has Detected a Large Methane Spike on Mars