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A galaxy is a group of many stars, with gas, dust, and dark matter. The name 'galaxy' is taken from the Greek word galaxia meaning milky, a reference to our own galaxy, the Milky Way.

Gravity holds galaxies together against the general expansion of the universe. In effect, the expansion of the universe takes place between groups of galaxies, not inside those groups. Gravity holds the galaxy together. The same applies to groups and clusters of galaxies, such as our Local Group where the Milky Way is, and the Virgo Cluster, a collection of more than 1,000 (might even be 2,000) galaxies. The gravitation is produced by the matter and energy in a galaxy or group of galaxies. Everything in a galaxy moves around a centre of mass, which is also an effect of gravity.

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How To Make SLIME & GALAXY SLIME | A Cool School Craft With Crafty Carol

How To Make SLIME & GALAXY SLIME | A Cool School Craft With Crafty Carol
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DIY PAPER SQUISHY / DIY Galaxy Squishy / How to make a squishy without foam or puffy paint
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    KidzNet
The First Photo Of A Black Hole At The Center Of Our Galaxy

The First Photo Of A Black Hole At The Center Of Our Galaxy
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History of Samsung
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Guardians of the Galaxy Lego
Guardians of the Galaxy Lego
Battle for the Galaxy
Battle for the Galaxy
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