http://sciencenews.org/view/generic/id/69125/title/FOR_KIDS_A_solid_discovery
Most of us think there are nine planets orbiting the sun, but there are others outside of the solar system called exoplanets. Over 500 of them have already been discovered, but recently, a more important one has been discovered. In Seattle during January, astronomers confirmed that the newly discovered planet is solid, unlike any of the others which are either unknown or made of gas. This planet is called Kepler-10b. It is 656 light years away, has a diameter 40% larger than the Earth's, and its mass is 4 times the Earth's. Kepler's orbit isery close to its star, so it is extremely hot, and cannot support liquid water, for it will evaporate. Astronomers found this planet by using the Heck telescope, which is located at the top of a dormant volcano in Hawaii. Astronomers are very excited about finding this planet in specific because it is the only one discovered so far that is solid like the Earth.
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