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Earlier this year, a European team of astronomers said they had confirmed another planet in the habitable zone, but that one was hot and barely on the inside edge of the habitable zone. For Marcy, who is on the Kepler team, the newest planet is a smidgen too large. But, "that smidgen makes all the difference," he said. Because its size implies that it's closer to Neptune in composition than Earth, "I would bet my telescope that there is no hard, rocky surface to walk on," Marcy said. Chief Kepler scientist William Borucki said he thinks the planet is somewhere between Earth and gas-and-liquid Neptune, but that it has a lot of rocky material. It's in a size range that scientists don't really know anything about. Measurements next summer may help astronomers have a better idea of its makeup, he said. The planet is 600 light years away. Each light year is 5.9 trillion miles. It would take a space shuttle about 22 million years to get there. Kepler spots a planet when it passes in front of its star. NASA requires three of those sightings before it begins to confirm it as a planet. Borucki said the third sighting for 22b happened a year ago, just before the telescope shut down for a while. It took several months to finish the confirmation. "It's a great gift," Borucki said. "We consider this sort of our Christmas planet." ___ Online: NASA's Kepler Telescope:
http://www.nasa.gov/kepler/
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