![]() ![]() Over time, this could be the fate of other satellite galaxies in the area. Either way, it is clear that this bunch of stars has been pulled very close to our Milky Way by our galaxy’s massive gravity. Instead they think it is just a dense area of faraway stars that are still part of the Milky Way. Some scientists don’t think the Canis Major cluster of stars is actually its own galaxy or dwarf galaxy. Where Does One Galaxy Start and the Other End? It undergoes a process at the end of which two daughter cells are produced. It’s about 25,000 light-years away from us. A cell of an organism has four chromosomes. The subtype (0, a, b, or c) is based on the relative prominence of the central bulge and how tightly wound the spiral arms are. It is so close to the edge of the Milky Way that it is closer to our solar system than to our galaxy’s center. Subtypes are labeled as SAB0, SABa, SABb, or SABc, following a sequence analogous to the Hubble sequence for barred and unbarred spirals. This detailed image shows the major known components of the Orion spur and the location of the Sun (yellow dot). The classification column refers to the galaxy morphological classification used by astronomers to describe galaxy structure. The Milky Way (like other spiral galaxies) is surrounded by a large halo region which contains globular clusters, large clouds of hydrogen gas, and a huge mass of the mysterious dark matter. It was discovered by Pierre Mchain in 1781 a and was communicated that year to Charles Messier, who verified its position for inclusion in the Messier. Below is a list of notable spiral galaxies with their own articles. Scientists estimate that it contains around a billion stars. The Pinwheel Galaxy (also known as Messier 101, M101 or NGC 5457) is a face-on spiral galaxy 21 million light-years (6.4 megaparsecs) away from Earth in the constellation Ursa Major. It orbits over the top and down below the disk of our galaxy, like a ring over a spinning top.īut there is something even closer to our Milky Way-a cluster of stars named by some to be the Canis Major Dwarf Galaxy. It’s about 50,000 light-years away from the Milky Way center. One group of stars is small enough that astronomers consider it a “dwarf galaxy.” The other group is so close that they still debate whether or not it is part of our galaxy or its own dwarf galaxy.Īstronomers have named the one that everyone agrees on the Sagittarius Dwarf Spheroidal Galaxy. In terms of distance, there are two contenders for closest satellite galaxy. ![]() Some scientists think that is because the Milky Way and other galaxies are pulling and warping it. Spiral galaxies are so named because of their visible and notable arms that wrap around the disk. Unlike our spiral galaxy, this one lacks a clean spiral shape. A spiral galaxy is a classification given to a massive grouping of stars, space dust, and gas. It is about 163,000 light-years away and around 1/100th the size of the Milky Way. labeled with the letter Irr and are essentially coarse masses of stars that lack any real. The Milky Way has a number of satellite galaxies, but the biggest one is the Large Magellanic Cloud. A schematic of a typical normal spiral galaxy is shown in. ![]()
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