Astronomers in recent years have discovered two dwarf planets researchers suggest may mark the inner edge of the Oort Cloud, the realm of comets.
They also think there could be hundreds of bodies out there 200 miles or more in diameter, plus maybe one or two as big as Earth or Mars. Many of the bodies observed so far also sport ultra-red material on their surfaces, which might be organics.
Tuesday, April 15, 2014
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