Celestial Bodies, Classification of Celestial Bodies, Stars (For CBSE, ICSE, IAS, NET, NRA 2022)

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Celestial Bodies

  • Celestial bodies or heavenly bodies are objects in space such as the sun, moon, planets, and stars.
  • They form a part of the vast universe we live in and are usually very far from us.
  • The beautiful night sky is dotted with such objects and when you observe them using a telescope, they reveal fascinating worlds of your own.
  • Because they are very far away, you cannot see all of them using the naked eye and we rely upon telescopes to study them.
  • So, we can define heavenly bodies as, A planet, moon, star, or other natural objects in the space
Celestial Bodies
  • The term celestial body is as large as the entire universe, both known and unknown.
  • So, a celestial body is any natural body outside of the Earth՚s atmosphere.
  • The Kuiper belt contains So many celestial bodies.
  • Any asteroid in space is a celestial body.
  • It is a disk-shaped region in the outer solar system lying beyond the orbit of Neptune and extending to a distance of 50 astronomical units, containing thousands of small icy bodies, some of which are on highly elliptical orbits, periodically visiting the inner solar system as comets.

Classification of Celestial Bodies

Celestial Bodies

Celestial Bodies

Stars

  • Stars are giant balls of hot gases that can produce their own light.
  • They gave out energy by converting Hydrogen gas into Helium in their cores.
  • They are gigantic in size and have immense gravitational attraction.
  • The sun is a medium-sized star that gives us energy and makes life possible on earth.

Planets

  • Planets are large spherical objects that revolve around the sun.
  • They move in fixed orbits around the sun.
  • There are 8 planets in our solar system.
  • They may be made of rocks, metals and gases like hydrogen, nitrogen, and methane.
  • The earth is also a planet and is the only known place in the universe which supports life.
  • Planets that revolve around other stars are called exoplanets.

Satellites

  • Satellites are objects that revolve around planets.
  • They form the essential part of the celestial bodies. These may be of natural origin or sent by humans.
  • The moon is a natural satellite of the earth and revolves around it because it is bound by the Earth՚s gravitational pull.
  • We have also placed artificial or man-made satellites around the earth and other planets to study them and for communication purposes.

Comets

  • These are small chunks of ice and rock that come from the outer edge of the solar system.
  • When its orbit brings it closer to the sun, the ice on them vaporizes creating a beautiful tail behind them.

Asteroids

  • These are small irregularly shaped rocks made up of metal or minerals that orbit the sun.
  • Most of them are found between Mars and Jupiter in an area known as the asteroid belt.

Meteors and Meteorites

  • These are objects from space that enter our atmosphere as they are pulled by the earth՚s gravity.
  • Meteors usually are small and burn up in the atmosphere as they enter the earth. This creates streaks in the sky as though a star has fallen.
  • They are commonly called shooting stars.
  • If a meteor is large enough it can reach the ground and create a crater.
  • These objects are called meteorites.

Galaxies

  • Galaxies are large groups of stars held together by gravity. The sun and the solar system are part of a galaxy known as the Milky Way.
  • Other of them is usually so far away that they look like stars in the night sky.

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