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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 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
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? - Scientific American A view of the spiral galaxy NGC 3982, as seen by NASA’s Hubble Space Telescope Galaxies come in many different variations, but astronomers classify them into four main types: spiral, elliptical
Galaxies—facts and information - National Geographic Galaxies are sprawling systems of dust, gas, dark matter, and anywhere from a million to a trillion stars that are held together by gravity Nearly all large galaxies are thought to also
What’s a galaxy? All you need to know - EarthSky A galaxy is a vast island of gas, dust and stars in an ocean of space Typically, galaxies are millions of light-years apart Galaxies are the building blocks of our universe
How Galaxies Work | HowStuffWorks A galaxy is a large system of stars, gas (mostly hydrogen), dust and dark matter that orbits a common center and is bound together by gravity — you can think of them as "island universes " There are many types of galaxies spanning all sorts of shapes and sizes
Galaxy Types - Science@NASA Scientists sometimes categorize galaxies based on their shapes and physical features Other classifications organize galaxies by the activity in their central regions – powered by a supersized black hole – and the angle at which we view them
Hubbles Galaxies - NASA Science Our galaxy, the Milky Way, sits in a Local Group of more than 20 galaxies, but Hubble’s vision takes us far beyond our celestial neighborhood Galaxies are the visible foundation of the universe; each one a collection of stars, planets, gas, dust, and dark matter held together by gravity