New York New York City, posted on April 23, 2013. Cmdr. Chris Hadfield tweets: Incredibly clear, before the trees have filled with leaves. (Chris Hadfield/NASA) Orbiting some 230 miles above Earth, Chris Hadfield, commander of the International Space Station, has become something of a social media sensation. Since the Canadian astronaut arrived on the ISS on Dec. 19, he has been posting extraordinary images of Earth and uploading videos that answer our most pressing questions about life in space. This...

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CAPE CANAVERAL, Fla. -- NASA's Cassini spacecraft has captured stunning views of a monster hurricane at Saturn's North Pole. The eye of the cyclone is an enormous 1,250 miles across. That's 20 times larger than the typical eye of a hurricane here on Earth. And it's spinning super-fast. Clouds at the outer edge of the storm are whipping around at 330 mph. (More: ) The hurricane is parked at Saturn's North Pole and relies on water vapor to keep it...