A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.The word galaxy is derived from the Greek galaxias literally “milky”, a reference to the Milky Way.

On Icy Pluto, Volcanoes May Spout Liquid Water

A whiff of ammonia in reddish ices on Pluto may be evidence of recent geological activity on the dwarf planet, with liquid water spewing out from Pluto’s depths like molten lava would on Earth, a new study finds. These findings suggest that Pluto may harbor at least some features favorable to the evolution of life, researchers said. Scientists …

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Milky Way Galaxy

The Milky Way is the galaxy that contains the Solar System. The name describes the galaxy’s appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye. The term Milky Way is a translation of the Latin via lactea, from the Greek γαλαξίας κύκλος (galaxías kýklos, “milky …

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