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The planet, called HD 189733b, revolves around a bright star 64 light years from Earth. Scientists refer to the planet as a "hot Jupiter" (it's similar to but slightly larger than Jupiter — and keeps a much tighter orbit around its sun, ensuring a scorching climate). And they have examined it for water before. But earlier tests of the planet's atmosphere yielded uncertain results, so this time, astrophysicists tried something slightly different. When HD 189733b was passing in front of its sun, they observed the way electromagnetic radiation was absorbed by the planet's atmosphere.