Answer / Durga Rani

The hydrogen envelope, or coma, of a comet derives its hydrogen most directly from the sublimation of water ice in the comet's nucleus.

Tell me how many planets are now in the solar system?

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How big is the universe?

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How old is our earth?

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What do astronomers call the point in the sky that is directly overhead?

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Tell me how many moons does uranus have?

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Which of the constellations cannot be seen in the summer sky of the northern hemisphere?

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What is the density of stars?

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What term is most commonly used to refer to the actual motion that stars have in relation to each other, and over many years will lead to changes in the shapes of constellations?

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Explain how old is this universe?

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Which is the only star of the milky way galaxy?

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Does non-carbon based life exist somewhere in the universe?

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Which moon is the only other body in our solar system, besides the earth, that has an atmosphere of mostly nitrogen?

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