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Astronomy

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Summary 1 : The study of the Universe
The Universe consists of the space, planets, all the different stars and other matter in it. The size of the Universe is beyond our imagination. According to astronomers a huge explosion named the Big Bang created the Universe about 14 billion years ago . There are four basic forces that control the Universe : electromagnetism, the weak force, the strong force, and gravity. The asteroids, galaxies, comets, black holes, red dwarfs, meteors, moons, planets etc also constitute the Universe. There are nine planets planets in our solar system. They are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. The distances between these planets are huge compared to their sizes. The Sun is about the size of a grapefruit, on a scale of 1to 10 billion. Galaxies are vast collections of stars, gas and dust spinning in space and held together by gravity.
Summary 2 : Observing the sky
The night sky was made for us to observe. The stars and other celestial objects seem to lie on a large celestial sphere surrounding the Earth. The celestial sphere is an imaginary hollow sphere surrounding Earth to which all objects in the sky were once considered to be attached. The celestial equator is another important imaginary line on the sky. Actually this line is an imaginary circle on the celestial sphere, directly over or above Earth’s equator. As the celestial sphere appears to rotate above us, all the stars rotate on paths that are parallel to the celestial sphere. At the North Pole, where the north celestial pole and Polaris are exactly overhead, the celestial equator is on the horizon. The angular distance is the angular separation between two objects as seen by some observer. The angular distance is measured in degrees. The angle made between the top (or one edge) of an object, the observer and the bottom (or opposite edge) of

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