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Pluto's moon Hydra

In 1930, Pluto was observed for the first time. For many decades, astronomers thought that the "ninth planet of the Solar System" was a solitary object. But by 1978, astronomers discovered that it also had a moon roughly ...

dateJul 14, 2015 in Space Exploration
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Image: Hubble captures galaxy PGC 18431

There are many galaxies in the universe and although there is plenty of room, they tend to stick together. The Milky Way, for example, is part of a large gathering of more than fifty galaxies known as the Local Group. Galaxy ...

dateJun 15, 2015 in Astronomy
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