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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 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.
Jun 13, 2024 · 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. When you look up at stars in the night sky, you’re seeing other stars in the Milky Way.
List of galaxies. Size (left) and distance (right) of a few well-known galaxies put to scale. The following is a list of notable galaxies . There are about 51 galaxies in the Local Group (see list of nearest galaxies for a complete list), on the order of 100,000 in the Local Supercluster, and an estimated 100 billion in all of the observable ...
Apr 17, 2019 · 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...
Aug 25, 2021 · Galaxies are groups of stars and other space objects held together by gravity. There are more than 100 billion galaxies in the universe, each presenting beautiful structures that can be seen in...
Jan 4, 2019 · Galaxies are composed of stars, dust and dark matter, all held together by gravity. Astronomers aren't certain exactly how galaxies formed. After the Big Bang, space was made up almost entirely...
May 2, 2022 · A galaxy is an astronomical structure containing millions to billions of stars, gas, and dust bound together by gravity. Interestingly, there is no agreed-upon definition of what a galaxy is. Even with the definition provided above, there is no distinction between a galaxy and a large star cluster.
Jul 13, 2022 · How galaxies form: Theories, variants and growth. Our best current theory about how galaxies form involves gravity, dark matter and mergers. This Hubble image shows two galaxies, NGC4038 and...
Many of these galaxies tend to be small and clumpy, often with a lot of star formation occurring in the massive knots. The question of how these clumpy galaxies evolve and develop structure over time is a big open question in astronomy, and JWST is helping astronomers to learn more.
