help.15 points!!!!!!!!!!!!!!
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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(γαλαξίας), literally "milky", a reference to the Milky Way. Galaxies range in size from dwarfswith just a few billion (109) stars to giants with one hundred trillion(1014) stars,each orbiting its galaxy'scenter of mass. Galaxies are categorized according to their visual morphology aselliptical,spiralandirregular
shlapy1gaming:
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**a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
**Several thousand galaxies, each consisting of billions of stars, are in this small view. XDF (2012) view: Each light speck is a galaxy, some of which are as old as 13.2 billion years – the observable universe is estimated to contain 200 billion to 2 trillion galaxies.
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