How many theories exist about how the earth was formed?

1 Answer
Cosmic Defect
Nov 7, 2017

Two hypotheses - The Nebular Hypothesis and The Close Encounter Hypothesis.

Explanation:

There were two hypotheses regarding the formation of planets - The Nebular Hypothesis and The Close Encounter Hypothesis. The Close Encounter Hypothesis has been ruled out now. Nebular Hypothesis is reasonably successful in explaining many features of the solar system and has even made predictions that have been verified. However it is still in the hypothesis stage and not yet a Theory.

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