Question

On the cosmic calendar, roughly when did Earth form?

Answer 1

The Cosmic Calendar is a scale in which the 13.7 billion year lifetime of the universe is mapped onto a single year. This image helps to put cosmology, evolution, and written history in context. At this scale the Big Bang took place on January 1 at midnight, and the current time is mapped to December 31 at midnight.

Answer 2

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