Essay for the Andromeda Galaxy

The Andromeda Galaxy

Introduction/Abstract

The Andromeda galaxy may be the closest full size galaxy to the Milky Way because of this it truly is known as our nearest galactic neighbor. The Andromeda Galaxy is also the sole galaxy visible to the bare eye inside the Northern Hemisphere. At 2 . 9 million light-years by Earth, Andromeda is also the farthest subject that can be viewed from The planet. Andromeda isn't just known as each of our closest neighbour but experts also consider Andromeda as well as the Milky Method as sister galaxies. Andromeda closely is similar to the Milky Way in form (spiral), composition, and division of chemical substance elements. Although that is where their commonalities end, intended for Andromeda dwarfs the Milky Way and possesses around two times as many stars. Main Body system

This galaxy is set among the stars from the constellation of Andromeda, the tiny misty blur that astronomers know by the listing number M 31 is simple to miss. Yet irrespective of its unassuming appearance, Meters 31 is usually immensely higher than the stars that surround that. For centuries, astronomers thought that the Andromeda galaxy was just a nebula, a impair of light-reflective dust and gas positioned within the Milky Way. Then simply, in the eighties, astronomer Isaac Roberts employed a 20-inch telescope to adopt the 1st detailed picture of Andromeda. For the first time, the spiral biceps and triceps were unveiled; but since no one will certainly make out any individual stars, Meters 31 would still be assumed as a nebula. Ideas changed after having a 100-inch telescope, the planet's largest, opened up on Support Wilson around Los Angeles in 1917. The fantastic astronomer Edwin Hubble surely could see initially that the outer spiral biceps and triceps of the Andromeda galaxy covered individual actors. Theses made an appearance similar to various found in the Milky Way, but had been much fainter. Hubble located three novae. One of these novae, however , developed into a Cepheid variable, a star that changes predictably in lighting. This Cepheid, and others therefore discovered in the Andromeda...

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