Answer :

(a) A group of star forming various patterns is called a constellation.

Stars form various patterns known as constellation. Ursa Major or Big Bear is a constellation and Saptarishi is the most easily recognizable constellation.

(b) A huge system of stars is called galaxy.

There are billions of galaxies that forms the Universe. Our solar system is a part of Milky Way galaxy, which is also known as Akash Ganga.

(c) Moon is the closest celestial body to our earth.

Earth has only one satellite that is the moon. Its diameter is only one quarter that of the earth. It’s about 3, 84,400 km away from the earth.

(d) Earth is the third nearest planet to the sun.

Life supporting conditions are found only on the earth. From the outer space, earth appears blue because its two-thirds surface is covered with water. It is therefore, called a blue planet.

(e) Planets do not have their own heat and light.

Planets are lit by the light of the stars. The word ‘planet’ comes from the Greek word ‘Planetal’ which means ‘wanderers’. The Earth gets its heat and light from the Sun.

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