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Whose observations first showed that the Moon is not a smooth perfect sphere?

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Quick Answer

Galileo Galilei showed in 1609–1610 that the Moon has mountains, valleys and craters. His telescopic observations contradicted the old idea of a flawless celestial sphere.

The Full Story

Galileo used the telescope to study the Moon and concluded it had a rugged surface, including mountains, craters and dark plains. This was revolutionary because many philosophers believed the heavens were perfect and unchanging. His observations, published in Sidereus Nuncius in 1610, helped establish that the Moon is a real world with geography like Earth’s. That insight reshaped astronomy and supported the idea that planets and moons obey the same physical laws.

Key Facts

1.Galileo’s lunar observations were published in 1610
2.He identified mountains and craters on the Moon
3.His work challenged the notion of perfect celestial spheres

YouTube Angle

Suggested video title for this topic:

"The telescope view that made the Moon look like a world"

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