[1][2] the word is derived from the greek galaxias (γαλαξίας), literally 'milky', a reference to the milky way galaxy that contains the solar system. Each one a collection of stars, planets, gas, dust, and dark matter held together by gravity. A galaxy is any of the systems of stars and interstellar matter that make up the universe
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Many such assemblages are so enormous that they contain hundreds of billions of stars
Galaxies consist of stars, planets, and vast clouds of gas and dust, all bound together by gravity
A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity We live on a planet called earth that is part of our solar system But where is our solar system It’s a small part of the milky way galaxy.
Our galaxy, the milky way, sits in a local group of more than 20 galaxies, but hubble’s vision takes us far beyond our celestial neighborhood Galaxies are the visible foundation of the universe
