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Watch Triton Orbit Neptune via Kepler Space Telescope | Video

'Giant Hurricane' on Saturn: 1st Images Back from Cassini's Epic Ring Dive

Researchers Probe Viability of Amino Acids in Alien Environments

Piers Sellers: The Astronaut Who Wanted to Save the Earth

NASA Returns First RED Camera From Orbit, Demos First Live 4K Video From Space

Tropical Storms Create Gamma-Ray Flashes | Video

Closest Saturn Pics Yet Snapped During Daring Cassini Dive | Video

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Alien Planet with Earth's Mass Discovered ... But It's an 'Iceball'

NASA's Dawn Probe at Dwarf Planet Ceres Loses Another Reaction Wheel

Student's Genes in Space Test Looks at Effects of Microgravity on Chromosomes

Cassini's Journey into the Unknown: NASA Engineer Talks Saturn Risks & Rewards (Video)

On Saturn's Moon Titan, Twilight Outshines Daylight

Cassini Saturn Probe Survives 1st 'Grand Finale' Dive

Cassini Spacecraft's Grand Finale Dives - Risk vs. Reward Explained by NASA | Video

Solar Eruptions Explained in '5 Steps' by NASA | Video

Binge-Watch Carl Sagan's 'Cosmos' on Twitch for Science Week

Mars Had Surprising 400-Million-Year Lull Between Giant-Impact Eras

'PACMan' Tool Could Help Figure Out Hubble's Observations

US Launches Ballistic Missile Test Amid Rising Tensions with North Korea