What is in the galaxy?
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A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity. Our galaxy, the Milky Way, also has a supermassive black hole in the middle. read more
Source: spaceplace.nasa.gov
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 (γαλαξίας), literally "milky", a reference to the Milky Way. read more
Source: en.wikipedia.org
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Source: universetoday.com
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Definition of Galaxy by Merriam-Webster
www.merriam-webster.com
Galaxy Information and Facts
www.nationalgeographic.com
Science Mission Directorate
science.nasa.gov
What is a Galaxy?
www.universetoday.com
What is a galaxy? :: NASA Space Place
spaceplace.nasa.gov
