Galaxies

Galaxy is a fundamental unit of the Universe. It consists of several hundred thousands of stars together with interstellar gas and dust. Thousands of million of galaxies stretch out to the limits of the observable Universe. They fall into four categories in shape; spiral, spherical, elliptical and irregular. Our galaxy is spiral, contains 100000000000 stars with a diameter of 100000 light years and it is called the Milky Way. According to Greek legend, the pearly band of the milky way stretching across the sky is milk split from the breast of the goddess Juno. The nearest spiral galaxy to the milky way is Andromeda Galaxy; it is 2,200,000 light years away from us. This is our galactic neighbor along with Large Magellanic Cloud which is 170,000 light years away. The arms of the spiral galaxy are called the galactic arms. A collection of galaxies is called cluster.

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