Image: This artist's conception shows a Jupiter-sized planet forming from a disk of dust and gas surrounding a young, massive star. - NASA Astronomers have discovered nearly 500 planetary systems each with multiple planets, and typically these systems include a few planets with masses several times greater than Earth's (super-Earths), orbiting closer to their star than Mercury is to the Sun, and Jupiter-like gas giants are also often found close to their star. [2]
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