Question

On the cosmic calendar, about when did Earth form?

Answer 1

6 Sep   - 4.4 Bya(Billion Years Ago) - Oldest rocks known on Earth.

Answer 2

Carl Sagan's cosmic Calendar. The 13.7 billion year lifetime of the universe mapped into a single year. At this scale the Big Bang takes place on January 1 at midnight, that current time December 31 at midnight, and each second is 434 years.

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