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4th answer :- Earth is unique because life exist here and It is in habitable zone were the temperature is balanced. It is in the certain distance from the sun were the existence of the earth and the life on it is possible.The water is in liquid form. etc...
5th answer :- An astronomer is a scientist in the field of astronomy who focuses their studies on a specific question or field outside the scope of Earth. They observe astronomical objects such as stars, planets, moons, comets and galaxies – in either observational (by analyzing the data) or theoretical astronomy.
6th Answer :- Satellite - An object that orbits another object. Natural satellite - A small or secondary planet which revolves around a larger one. Artificial satellite - A man-made object placed (or designed to be placed) in orbit around an astronomical body (usu. the earth).
7th Answer :- Bhaskara – II(20th November 1981) (Decay date: 30th November 1991)First Indian Satellite for Earth observation from orbit.
INSAT- 1A(Indian National Satellite) (10th April 1982)First operational multipurpose communication and meteorology satellite.
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Answer:
1. Earth is called a unique planet because it is the only planet which has suitable conditions for living like air,water,and oxygen etc.
2.A person who study astronomy is known as astronomer.
3.A small or secondary planet which revolves around another one is known as natural satellite.
Example - moon
A man made object placed in orbit around an astronomical body is known as man made satellite.
4.Aryabhatta and Bhaskara -1
Explanation:
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