Spiral galaxy facts8/7/2023 The galactic disc contains more gas, dust and young stars. 19, 2018 by Contributor, Elizabeth Howell. Spiral galaxies have a central bulge and arms that spiral out and around the nucleus of the galaxy. Its discovery will help scientists understand how galaxies transition from "highly chaotic, turbulent discs" to more organized and thinner discs, like that of the Milky Way. In 2017, astronomers discovered an 11-billion-year-old ancient spiral galaxy called A1689B11. Updated: Table of Contents What is a Spiral Galaxy Examples of Spiral Galaxies Six Interesting Spiral Galaxy Facts Lesson Summary What is a Spiral Galaxy Space is made of. Milky Way Galaxy, large spiral system consisting of several hundred billion stars, one of which is the Sun. One of the largest known spiral galaxies is NGC 6872, which is 522,000 light-years across from the tips of its outstretched spiral arms - that's about 5 times the size of the Milky Way. But it's unclear how common elliptical galaxies are as they're made up of older, dimmer stars, and are more challenging to spot. Spiral galaxies are thought to evolve into elliptical galaxies as the spirals get older. Encounters between galaxies could cause such waves as the mass of the smaller galaxy could affect the structure of the larger galaxy as the two combine. The Triangulum Galaxy is a spiral galaxy with no central bar and its loosely wound arms emanate from the galactic core. A kiloparsec is 1,000 parsecs or 3,260 light-years. One theory suggests the galaxy arms could be the result of density waves traveling through the outer disk. Some spiral galaxy facts are: Size - The size can range from 5 to 100 kiloparsecs across. Galaxy MCG+01-02-015, located about 293 million light-years away, appears to be a relatively typical, evolved spiral galaxy, with dusty arms and a gas-rich disk. How the spiral arms form continues to puzzle scientists.
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