Monday, March 14, 2011

'Weirdest planet' Mercury to get NASA close-up

mars
Earth is about to get better acquainted with its oddball planetary cousin, Mercury, a rocky wonderland of extremes.

Sure, Mars may fascinate science fiction authors, Jupiter looms large and Saturn has stunning rings, but tiny Mercury can claim the title as weirdest planet in the solar system. It has the wildest extremes from hot to cold. A day on Mercury somehow lasts longer than its year. And maybe strangest of all, scientists think it holds tons of ice in dark craters despite being the planet closest to the sun.

On St. Patrick's Day, for the first time, a small NASA spacecraft called Messenger will enter into Mercury's orbit, circling at times as close as 125 miles from the planet's surface. And by coincidence, a few days before that will be the best time all year for people on Earth to see Mercury with the naked eye.

Barely bigger than our moon but much more distant, Mercury is not easy to see without a telescope. An odd pairing with giant Jupiter will make it easier to spot starting Sunday - probably the best opportunity for a year, said Geoff Chester at the U.S. Naval Observatory in Washington.

Chester said people in the Northern Hemisphere should look to the west after sunset. Jupiter will be about 10 degrees above the western horizon. Mercury will be about finger's width to the right of Jupiter.

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