alleryAbout how long ago did the Solar System form?
A1.2 billion years ago
B2.5 billion years ago
C13.8 billion years ago
D4.6 billion years ago
Answer & Solution
Correct answer: D. 4.6 billion years ago
1. A dense region of a molecular cloud collapsed to form the Sun.
2. This happened about 4.6 billion years ago.
3. 13.8 billion years is far older, and 1.2 or 2.5 billion are much too young.
_Source: Wikipedia, Solar System, Lead section_
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