NASA Celebrates Anniversary Of Earth Observing System With Amazing GIFs

In December 1999, NASA launched the Terra satellite to collect climate data. It would be the first spacecraft in a fleet of 18 Earth-observing satellites that, over the last 15 years, have opened up a new era of exploration of our home planet. To celebrate, the space agency has compiled some of its most stunning gifs. » 12/19/14 6:40am Yesterday 6:40am

Decoding Hidden Messages In Those Geeky Spy Satellite Mission Patches

Last year, the National Reconnaissance Office sparked a media frenzy when it released a spy satellite mission patch depicting an Earth-eating octopus. But, that's not even close to the weirdest logos bestowed upon U.S. spy satellites—and space enthusiasts believe they're codes for the secret mission payloads. » 12/15/14 6:20am Monday 6:20am

The Real Story Of Apollo 17... And Why We Never Went Back To The Moon

On December 11, 1972, Apollo 17 touched down on the Moon. This was not only our final Moon landing, but the last time we left Low Earth Orbit. With the successful launch of the Orion capsule, NASA is finally poised to go further again. So it's important to remember how we got to the Moon — and why we stopped going. » 12/12/14 1:44pm 12/12/14 1:44pm

A Mesmerizing Video Shows One Year Of The Moon’s Phases In Five Minutes

The Moon always keeps the same face to us, but not exactly the same face. Because of the tilt and shape of its orbit, we see it from slightly different angles over the course of a month. And when each month is compressed into 24 seconds, as in this video, our changing view of the Moon makes it look as if it's wobbling. » 12/11/14 10:40am 12/11/14 10:40am

Join Us For Orion's First Test Flight! [LIVE COVERAGE] [UPDATED]

It's almost time for the first-ever test flight of the Orion spacecraft, NASA's human deep space exploration vehicle. Watch the live feed and follow along with us as we work through the countdown, launch, test flight, and landing! Update: The launch is scrubbed; next attempt Friday 7:05 am EST. » 12/04/14 7:06am 12/04/14 7:06am