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one by one, like a chain sequence

2007-02-15 22:14:01 · 3 answers · asked by FakieVarialFlip 1 in Science & Mathematics Astronomy & Space

3 answers

A old, discarded theory before the Space Age was that planets closer to the Sun were "less advanced" than planets farther away.

For example, everyone "knew" that Venus was a young, lush, humid, swampy tropical paradise (like the Earth in the Cretaceous) and that Mars was dry and dessicated, populated with a highly evolved race facing extinction.

2007-02-16 17:50:22 · answer #1 · answered by stargazergurl22 4 · 0 0

It's more like a daydream. Some people have speculated that the Sun may have been hotter in the past, making Mars a more likely life planet in the past, Earth in the present, and perhaps Venus in the future. But our discovery of the actual conditions on Venus have killed that idea. Now, scientists are open to the possibility that primitive life might exist somewhere else in the solar system, but it's a matter of the local circumstances, not where a place is in relation to the Sun.

2007-02-16 06:57:50 · answer #2 · answered by skepsis 7 · 0 0

Nearest what?

You mean from planets in the inner solar system to outer? No that would make no sense - if they were all compatible with life - very, very unlikely, then it would develop all at the same time.

2007-02-15 22:34:31 · answer #3 · answered by Leviathan 6 · 0 0

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