The age of the Earth is estimated to be 4.5 billion years. Astronomers have been trying to conquer the universe since ancient times. As the distance to the infinite sky is reduced to kilometers, so the distance in space is measured in light years. The distance a ray of light travels for a kilometer is called a light year. According to this, one light year is 20600000000 kilometers. Earth is in a galaxy called Dudhganga. A galaxy is a galaxy. There are four types of galaxies in shape. Spiral or annular, bard spiral or swastika annular, elliptical and irregular. Our Milky Way is curved. Its stars revolve around the center in the form of annular wings. All the galaxies are moving and moving away from each other thus the universe is constantly evolving. The Andormeda Galaxy is closest to our Milky Way galaxy, about 20 million light-years away.
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