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en.wikipedia.org/wiki/Galaxy

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 ...

science.nasa.gov/astrophysics/focus-areas/what-are-galaxies

Our galaxy, the Milky Way, is typical: it has hundreds of billions of stars, enough gas and dust to make billions more stars, and at least ten times as much dark ...

spaceplace.nasa.gov/galaxy/en

Sep 8, 2015 ... 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.

www.space.com/25303-how-many-galaxies-are-in-the-universe.html

Apr 1, 2014 ... Astronomers say there are 100 billion to 200 billion galaxies in the universe. But accurately counting the number of galaxies depends on ...

www.nationalgeographic.com/science/space/universe/galaxies

A Hubble Space Telescope image shows unprecedented detail of the Antennae galaxies, an intense star-forming region created when two galaxies began to ...

www.space.com/15680-galaxies.html

May 14, 2012 ... Galaxies are composed of stars, dust, and dark matter, all held together by gravity . They come in a variety of shapes, sizes, and ages.

space-facts.com/galaxies

A galaxy is a massive, gravitationally bound system that consists of stars, stellar objects (such as brown dwarfs and neutron stars), nebulae, an interstellar ...

www.britannica.com/science/galaxy

Nature has provided an immensely varied array of galaxies, ranging from faint, diffuse dwarf objects to brilliant spiral-shaped giants. Virtually all galaxies appear  ...

www.skyandtelescope.com/astronomy-news/galaxies

With more than 100 billion galaxies in the observable universe, the exciting discoveries and unanswered questions are endless. We bring you all the latest ...