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A 360-degree view of Saturn’s auroras
Ultraviolet and infrared images from NASA's Cassini spacecraft and Hubble Space Telescope show active and quiet auroras at Saturn's north and south poles.
February 11, 2014
NASA photos suggest water might be flowing on Mars
New clues about the mysterious streaks that appear on the surface of Mars during warm weather. Scientists they might be caused by flowing water.
February 11, 2014
The oldest known star in the universe
The ancient star, about 6,000 light years from Earth, formed 13.7 billion years ago, shortly after the Big Bang. It's the oldest star yet found.
February 10, 2014
What if the sun disappeared?
We wouldn't know the sun was gone for eight-and-a-half minutes. Then Earth would head off in a straight line, into eternal night.
February 8, 2014
Video: Will this go faster than light?
Light speed is the ultimate speed in our universe. Why we haven't been able to build - or even conceive of - a contraption that goes faster than light.
February 7, 2014
View from space: Crescent moon and Earth’s atmosphere
Astronaut's view of crescent moon rising and the cusp of Earth's atmosphere.
February 7, 2014
Why does this brown dwarf have such strangely red skies ?
Brown dwarfs straddle the line between stars and planets. This one caught researchers' attention for its extremely red appearance. Turns out its atmosphere is laden with dust.
February 7, 2014
NASA spacecraft spots new crater on Mars
Cosmic paintball! NASA image of dramatic new impact crater on the planet Mars.
February 6, 2014
Polaris, aka the North Star, is getting brighter
Modern interpretations of the historical data indicate that Polaris could be as much as 4.6 times brighter than it appeared to some of the earliest astronomers.
February 5, 2014
Kepler discovers a wobbly planet with weird seasons
On Earth, the cycle of precession lasts 26,000 years. The planet Kepler-413b precesses, or wobbles, wildly on its spin axis, in a cycle of only 11 years.
February 5, 2014
