NASA Officially Cautious About 'Planet Nine' | Video

Return with Lunar Reconnaissance Orbiter

The Serious Search for Intelligent Life: 4 Key Questions

Last Moments of LCROSS – NASA Probes Hit Moon

Auroras Dance Over Saturn’s Poles

When Worlds Collide

Chandra: A Great Observatory

Stargazing: Welcome to the Universe

Earth’s Diamond Ring

Target: The “Fuzzies” – Galaxies, Nebulae and Comets

Spitzer’s Warm Mission

Constellation on Mars

Target: The Stars – Which Ones to Watch and Why

Echoes of a Supernova Explosion

The Herschel/Planck Mission

Planning the Assault: Why Bomb the Moon?

Black Hole Waltz

IMAX Hubble 3D: The Director’s Take – Exclusive Video

Arsenic Eating Bacteria Hint at Alien Life

Meteor Fall Caught on Camera

Fly By Neptune’s Freezing Moon Triton

Target: The Moon

CAUTION! – How to SAFELY Observe the Sun

Where is ET?: SETI vs. the Fermi Paradox

Phases of an Exoplanet