An astronaut is standing on the surafce of moon and is observing various natural phenomenon. Which of the following observation is incorrect regarding the various natural phenomenon observed by him?

There is no atmosphere on the moon.

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There is no time delay in actual sunset and apparent sunset.

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Stars do not twinkle

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The Sun is visible about 2 minutes before the actual sunrise

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Solution

The correct option is D The Sun is visible about 2 minutes before the actual sunrise
Moon does not have atmosphere. Advance sunrise and delayed sunset are visible due to atmospheric refraction and stars also twinkle due to atmospheric refraction.
Therefore we or an astronaut will not able to see twinkling of stars and advance sunrise and delayed sunset on the surface moon.

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