For the first time since exoplanets, or planets around stars other than the sun, were discovered almost 20 years ago, X-ray observations have seen an exoplanet.The planet, known as HD 189733b, is a hot Jupiter, meaning it is similar in size to Jupiter in our solar system but in very close orbit around its star. HD 189733b is more than 30 times closer to its star than Earth is to the sun. It orbits the star once every 2.2 days.
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