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The study of sunspots began back in 1609 by Galileo. Galileo noticed the sunspots while gazing through a telescope. The actual study did not commence until 1612.

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What is found on the surface that proves the sun rotates?

Scientists were able to prove that the Sun rotates by observing the movement of sun spots over time.


What are the spots called on the Sun?

Sun spots.


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Galileo looked at the sun and observed dark blemishes on its surface (which are now called sunspots). From the movement of these blemishes, he was able to determine that the sun has a rotation period of about one month.


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Are sun spots hotter or colder than adjacent parts of the sun?

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