[33] Edwin Hubble settled the debate in 1925 when he identified extragalactic Cepheid variable stars for the first time on astronomical photos of Andromeda. The velocities slowly decline beyond that distance, dropping to around 200km/s (120mi/s) at 80,000ly (5.1109AU). Valerie Mikles What is the Andromeda Galaxy? One difference is that the Andromeda galaxy is larger than the Milky Way and emits more light. We also link to other websites, but are not responsible for their content. The Milky Way is a barred galaxy with a diameter of 100,000200,000 light-years and an estimated visual diameter of 100,000200,000 light-years. The Andromeda Galaxy looms big in our night sky, as seen from Earth during its visits. [113] The best known and most readily observed satellite galaxies are M32 and M110. [16] Creationists have proposed many solutions. Andromeda Galaxy - Wikipedia Your submission has been received! Andromeda is a "close by" or "neighborhood" galaxy; it is generally believed to be about 2.2 million light years away. :) Guest Sep 15, 2015 Best Answer #1 +5 Just multiply the two numbers together and you will get this enormous number, Deep scans of the Andromeda Galaxy's outer regions have revealed large clouds and star streams structures. If youd like more info on galaxies, check out Hubblesites News Releases on Galaxies, and heres NASAs Science Page on Galaxies. Look generally northward on the skys dome for a pattern of stars shaped like the letter M or W. If you can recognize the North Star, Polaris and if you know how to find the Big Dipper be aware that the Big Dipper and Cassiopeia move around Polaris like the hands of a clock, always opposite each other. Andromeda's spectrum is very similar to the spectra of individual stars, and from this, it was deduced that Andromeda has a stellar nature. This finding sparked a debate over if the Andromeda spiral nebula and the other spiral nebulae are part of the Milky Way or not. We have also recorded an episode of Astronomy Cast about galaxies Episode 97: Galaxies.
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