Solar system was discovered by:

A. Kepler

B. Galileo

C. Copernicus

D. Plato

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Which planet is known as watery planet?

A. Mercury

B. Earth

C. Mars

D. Jupiter

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Among the planets of the solar system, the one which has the longest period of rotation is:

A. Mars

B. Venus

C. Saturn

D. None of these

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Which of the following planet is dropped from the list of planets in 2006?

A. Neptune

B. Mercury

C. Pluto

D. Jupiter

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