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Galaxy - Wikipedia A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity [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
Galaxies - NASA Science Galaxy Basics Galaxies consist of stars, planets, and vast clouds of gas and dust, all bound together by gravity The largest contain trillions of stars and can be more than a million light-years across The smallest can contain a few thousand stars and span just a few hundred light-years
Galaxy | Definition, Formation, Types, Properties, Facts - Britannica What is a galaxy? A galaxy is any of the systems of stars and interstellar matter that make up the universe Many such assemblages are so enormous that they contain hundreds of billions of stars Galaxies usually exist in clusters, some of which measure hundreds of millions of light-years across
Galaxies: Collisions, Types and How Theyre Made | Space This Hubble Space Telescope image shows the full beauty of nearby spiral galaxy M83 in a mosaic of many photos stitched together The magentas and blues indicate star-forming regions
What Is a Galaxy? | NASA Space Place – NASA Science for Kids What Is a Galaxy? The Short Answer: 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
What is a galaxy? - Live Science "At the most basic level, you can think of a galaxy as a collection of stars, gas and dark matter that is all gravitationally bound to each other," said Jenna Samuel, a doctoral candidate in
What’s a galaxy? All you need to know - EarthSky A galaxy can contain hundreds of billions of stars and be many thousands of light-years across Our own galaxy, the Milky Way, is around 100,000 light-years in diameter
Galaxy Facts - Interesting Facts about 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 medium of gas and dust, black holes, and an unknown component of dark matter
Galaxy - Simple English Wikipedia, the free encyclopedia Everything in a galaxy moves around a centre of mass, which is also an effect of gravity There are various types of galaxies: elliptical, spiral and lenticular galaxies, which can all be with or without bars