Andromeda Galaxy Research Paper
The Andromeda Galaxy
Introduction/Abstract
The Andromeda galaxy is the closest full size galaxy to the Milky Way because of this it is known as our nearest galactic neighbor. The Andromeda Galaxy is also the only galaxy visible to the naked eye in the Northern Hemisphere. At 2.9 million light-years from Earth, Andromeda is also the farthest object that can be seen from Earth. Andromeda is not only known as our closest neighbor but scientists also refer to Andromeda and the Milky Way as sister galaxies. Andromeda closely resembles the Milky Way in shape (spiral), structure, and distribution of chemical elements. But that is where their similarities end, for Andromeda dwarfs the Milky Way and contains around twice as many stars. Main Body This galaxy is set among the stars of the constellation of Andromeda, the tiny misty blur that astronomers know by the catalog number M 31 is easy to miss. Yet despite its unassuming appearance, M 31 is immensely greater than the stars that surround it. For centuries, astronomers thought that the Andromeda galaxy …show more content…
The great astronomer Edwin Hubble was able to see for the first time that the outer spiral arms of the Andromeda galaxy contained individual stars. Theses appeared similar to many found in the Milky Way, but were much fainter. Hubble located three novae. One of these novae, however, turned out to be a Cepheid variable, a star that changes predictably in brightness. This Cepheid, and others subsequently discovered in the Andromeda Nebula, enabled Hubble to prove that the Nebula was not a star cluster within our own Milky Way, but a galaxy more than a million light years away. Andromeda is especially important for astronomers because is so similar o the Milky Way. Since we can never see our own galaxy from the outside, we can observe and learn from our nearby sister instead- the next best
Introduction/Abstract
The Andromeda galaxy is the closest full size galaxy to the Milky Way because of this it is known as our nearest galactic neighbor. The Andromeda Galaxy is also the only galaxy visible to the naked eye in the Northern Hemisphere. At 2.9 million light-years from Earth, Andromeda is also the farthest object that can be seen from Earth. Andromeda is not only known as our closest neighbor but scientists also refer to Andromeda and the Milky Way as sister galaxies. Andromeda closely resembles the Milky Way in shape (spiral), structure, and distribution of chemical elements. But that is where their similarities end, for Andromeda dwarfs the Milky Way and contains around twice as many stars. Main Body This galaxy is set among the stars of the constellation of Andromeda, the tiny misty blur that astronomers know by the catalog number M 31 is easy to miss. Yet despite its unassuming appearance, M 31 is immensely greater than the stars that surround it. For centuries, astronomers thought that the Andromeda galaxy …show more content…
The great astronomer Edwin Hubble was able to see for the first time that the outer spiral arms of the Andromeda galaxy contained individual stars. Theses appeared similar to many found in the Milky Way, but were much fainter. Hubble located three novae. One of these novae, however, turned out to be a Cepheid variable, a star that changes predictably in brightness. This Cepheid, and others subsequently discovered in the Andromeda Nebula, enabled Hubble to prove that the Nebula was not a star cluster within our own Milky Way, but a galaxy more than a million light years away. Andromeda is especially important for astronomers because is so similar o the Milky Way. Since we can never see our own galaxy from the outside, we can observe and learn from our nearby sister instead- the next best