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Whose observations first showed that the Moon has a cratered surface like a world, not a perfect sphere?
Quick Answer
Galileo Galilei made the key telescopic lunar observations in 1609 and 1610. He saw mountains, valleys and craters on the Moon.
The Full Story
Galileo Galilei’s telescope revealed that the Moon was not smooth and perfect, as classical philosophy had claimed. In his 1610 work Sidereus Nuncius, he described shadows cast by lunar mountains and depressions. This was one of the first major scientific uses of a telescope and it changed ideas about the heavens. The Moon became evidence that celestial bodies could be rugged and Earth-like.
Key Facts
1.Galileo published Sidereus Nuncius in 1610
2.He saw mountains and craters on the Moon
3.His observations challenged the idea of perfect celestial spheres
YouTube Angle
Suggested video title for this topic:
"The Moon was rougher than anyone expected"
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