Why countdown while firing a aeroplane?
Explain the moon?
Explain the planets?
What is the sun?
What is equatorial and polar diameter?
Explain shape of the earth?
What is the weight of the earth?
What is the distance of the earth from the moon and the sun?
how stars comes from different sizes
What is eclipses?
What is astronomical telescope?
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What is the magnetic effect of the earth?
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What are the forces which keep a flying plane in a equilibrium?