Q8 of 41 Page 301

What is the mass of the earth?

Mass of the Earth is 6×1024 Kgs.


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6

Moon has no atmosphere. Why?

1.

 7

The Ursa Major consists of how many stars?

 9

In which direction do stars appear to move in the sky? Why do they appear to move in this direction?

 10

Stars appear as point while planets appear as discs. Explain why.