Tracking killer comets before they strike | PBS NewsHour

Altair and Barnard's "E"

NASA's Orion: "I’m on Board" – Erin Gray of Buck Rogers

Comet Lovejoy C2013 R1

Melotte 15 in the Heart

"Lake two-face" | International Space Station

NASA ScienceCasts: Sunset Solar Eclipse

"One second before sunset" | International Space Station

Hurricane Gonzalo in the Atlantic Ocean | NASA Terra Satellite

Power spacewalk on This Week @NASA

SpaceX Rocket Test Helps Prep for Journey to Mars | NASA

Huge Sunspot Emerges: Size Illustration

Coronal Loops on The Sun, Anyone? | NASA SDO

NASA's Space to Ground: Out the Door | Week of October 17, 2014

Gerst: "I love clouds!" | International Space Station

China Moving Forward with Big Space Station Plans | Space.com