The universe is commonly defined as the totality of everything that exist including all physical matter and energy, the planets, stars, galaxies and the content of intergalactic space.
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The Universe
Importants Points are:-
The study of universe is called cosmology.
A galaxy is milky way Galaxy (Akash Ganga) formed after big ban. Andromeda is the nearest galaxy of milky way.
Big bang theory was an explosion of concentrated matter in the universe that occured 15 billion years ago. It led to the formation of galaxies of stars and other heavenly bodies.
stars are the heavenly bodies made up of hot burning gases and they shins by emitting their own light.
comets are made up of frozen gases. Hailey’s comet reappears in 76 years , last seen in. 1986.
Constellations are the units to enable the astronomers to identify the position of the stars. There are 88 known constellation.
Satellites are the heavenly bodies taht revolve around the planets. Moon is the natural satelite.