"There's a lot of desire in the science community to understand extra-terrestrial planets, not just find them," said Ed Weiler, NASA's associate administrator for space science. "We've already found 300 or so, mostly from the ground. But now we're entering the stage of going beyond just proving that they exist. It's how many are out there, and perhaps the most important question of all, are there any 'Earths' out there?"
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