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answers:
Ronald 7 say: The Bionic Barf Bunnies from Vega.
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Gary B say: me
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Roger K say: My grandfather. He noticed that he was standing on something and decided to call it "Earth."
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shroud say: Urg - him was smart
him say ground needs name
we all gree
him pick name
we make Urg leader of tribe
him die next day, saber-tooth, we sad
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Kim say: O__o
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Raymond say: In modern astronomy, Earth was FINALLY (and officially) recognized as a planet when Newton published his Principia (around 1687)
https://en.wikipedia.org/wiki/Philosophi...
It was the book that explained the universality of gravity, and provided the mathematical proof that the Sun, not Earth, was the centre of the Solar system.
Many astronomers had proposed the same idea well before that, going back to the Greek astronomers over 2500 years ago, and we suspect, to the Babylonians before them.
However, they could not provide sufficient evidence to convince the others, so that the idea that Earth was "the centre of the universe" continued until the end of the 17th century (the end of the 1600s).
Earth itself was recognized as a separate entity by the Greeks, 2500 years ago. They even thought (most of them) that it was a sphere.
However, back then, the word "planet" only applied to objects that could be seen in the night sky: stars that moved in a predictable way among the fixed stars. Since Earth could not be seen in the sky, it was never called a "planet", even by those who thought it was in orbit around the Sun.
The observations that led others to understand that Earth was just another body in orbit around the Sun, were taken by Tycho Brahe... who firmly believed that Earth did NOT orbit the Sun. Tycho really believed Earth to be the centre of the universe. Kepler (Tycho's assistant) is the one who used Tycho's data - after Tycho's death - to propose the Sun as the centre of the planetary system.
Halley (the guy related to the comet of the same name) is to one who brought this to Newton's attention, and Newton then wrote about how gravity works, and showed that the Sun was over 300,000 times more massive than Earth, which made the Sun the centre of mass of the solar system.
It is Newton's argument that convinced the Church... and the rest of the astronomers (most of them had already accepted the idea, by then).
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Neo say: The aliens from Vergon 6.
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Jake say: Not sure
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quantumclaustrophobe say: I did. It was right under foot!
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. say: Humans
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