Mars’ moon Phobos slowly falling apart

The mysterious grooves on Phobos are likely early signs of structural failure. Scientists expect the moon to be pulled apart in 30 to 50 million years.

Cassini spots monstrous ice cloud on Titan

As winter sets in at the south pole of Saturn's moon Titan, a massive ice cloud has been forming. It's the "button" in this image from the Cassini spacecraft.

Comet Encke pelts Mercury with meteors

This comet is the same one causing the amazing display of Taurid fireballs on Earth this year. And so our solar system begins to seem a little more familiar.

Pluto might have ice volcanoes

Two of Pluto's mountains could be cryovolcanoes - ice volcanoes - that might have spewed an ammonia-ice slurry in the recent geological past.

Pluto’s moons spinning wildly

"These are four of the strangest moons in the solar system," said New Horizons mission's Mark Showalter. "We still don't know what to make of it."

NASA is recruiting astronauts

Want to be an astronaut? NASA is seeking explorers for future space missions. Here's what it takes and how to apply.

Amazing view across Mars’ Gale Crater

Another great glimpse of Mars - the world next door - from NASA's Curiosity rover.

Swift’s 1000th gamma-ray burst

This flash of gamma rays came at 6:41 p.m. EDT on October 27. Later, astronomers learned it had traveled toward Earth for 12 billion years.

SETI seeks signal from mystery star

Star KIC 8462852 made headlines last month for having a possible alien megastructure. SETI team now seeking deliberate radio signal. None found yet.

Solar wind likely stripped Martian atmosphere

Mars was once warm and wet, say scientists. But most of the water from its atmosphere was likely stripped away by solar winds.

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