Although Spectacular Collisions Like Comet Shoemaker-Levy 9 Impact with Jupiter

question 64

Multiple Choice

Although spectacular collisions like comet Shoemaker-Levy 9 impact with Jupiter in 1994 provide evidence that planetary accretion is still occurring, near all the mass of the solar nebula now resides in the sun and planets. When did Earth, for the most part, attain its current mass and volume?

• A) 65 million years ago
• B) 12,000 years ago
• C) it hasn't
• D) 4,500 million years ago

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