8 years ago
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Astronomers discover distant dwarf planet beyond Neptune
A dwarf planet half the size of Britain has been found tumbling through space in the most distant reaches of the solar system. The giant ball of rock and ice lies nine billion kilometres away on an orbit that swings far beyond the realm of Neptune, the most remote of the fully-fledged planets in our cosmic vicinity. Astronomers first noticed the new world when it appeared as a bright spot moving slowly across a sequence of images taken in September 2015 by a telescope on Mauna Kea in Hawaii for the Outer Solar System Origins Survey (OSSOS).
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https://www.theguardian.com
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