Stars: Some celestial bodies are very big and hot. They are made up of gases. They have their own heat and light which they emit in large amounts. These celestial bodies are called stars. The Sun is a star.
The twinkling spots of lights that we see in the sky at night are called stars. Stars are huge balls of very hot gaseous matter. Stars are formed from huge clouds of dust and gas.
Galaxy: Stars are found in very large clusters or groups. These clusters are called galaxies. A Galaxy is a huge system of billions of stars and clouds of dust and gases.
Universe: All the galaxies together make up the universe.
Milky Way Galaxy: Our galaxy is the Milky Way. It is also known as Aakash Ganga in Hindi. A white glowing path across the sky on a clear starry night is a Milky Way Galaxy. It is a cluster of millions of stars.
Constellations: Various patterns formed by the group of stars are called constellations. Since ancient times, hundreds of constyellations have been identified in the sky. Two more easily recognizable are Ursa Major and Orion. Ursa Major is also called big bear or Big Dipper because it takes the shape of large ladle. Orion is shaped like a hunter with a raised club. Saptrishi (seven stars) , Taurus (the bull) and Leo (the lion) are example of such constellations.
Pole star: The star that always remains in the same position (northern horizon) in the sky.
Which of the following are correct : (a) A star is a celestial object comprising a luminous plasma held together by its gravity. (b) The star nearest to the earth is the Sun itself. (c) The nearest star is the Alpha Centuari or Proxima Centuari. | |||
Right Option : B | |||
View Explanation |
A huge system of stars is called __________. | |||
Right Option : A | |||
View Explanation |
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