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The galaxy in which the Earth is located is called?
A. Andromeda
B. The Milky Way
C. The Whirlpool
D. The Sombrero
Correct Answer Is Option = The Milky Way
Notes / Explanation
The galaxy in which the Earth is located is called the Milky Way, an enormous system of stars of which our Sun and its solar system are a very small part. A galaxy is a vast collection of a great many stars, together with gas, dust and other matter, all held together by gravity, and there are a great many galaxies in the universe. Our own galaxy, the Milky Way, is one such galaxy, containing an enormous number of stars, far too many to count individually, of which our Sun is just one, an ordinary star among the vast multitude. The solar system, with its planets including the Earth, is located within the Milky Way, in one of its outer regions. The Milky Way is so named because, when seen from the Earth on a clear, dark night, away from the lights of cities, a faint band of light can be seen stretching across the sky, which is the combined light of the vast numbers of distant stars of our own galaxy, seen edge-on, appearing as a milky band of light, and from this appearance the galaxy takes its name. The Milky Way is enormous, so large that the distances within it are almost beyond imagination, and light itself, travelling at its enormous speed, takes a very long time to cross it. The galaxy has a shape, being a great disc with a central region and spiralling arms, and it is slowly rotating. Beyond our own galaxy lie a great many other galaxies, at enormous distances, each containing its own vast numbers of stars, so that the universe as a whole contains an almost unimaginable number of stars in a great many galaxies. The study of the galaxy and the universe beyond is part of the science of astronomy, which explores the vast scale and the wonders of the cosmos. The study of the Milky Way and the universe is an important part of the study of astronomy and of general knowledge. For PPSC and other competitive examinations, the key points to remember are that the galaxy in which the Earth is located is called the Milky Way, that a galaxy is a vast collection of a great many stars held together by gravity, that the Milky Way contains an enormous number of stars, of which our Sun is just one, and that it is so named from the faint band of light seen across the night sky, which is the combined light of its vast numbers of distant stars.
