Cosmic Calendar: First earth rocks formed

Jack Hills, of Narryer Gneiss Terrane, Western AustraliaOn Carl Sagan’s Cosmic Calendar (illustrated as a comic strip here), which maps the entire history of our cosmos onto a single year, September is particularly interesting.

Today, on the 16th (4.0 billion years ago), the oldest known rocks on earth are formed.

Advertisements
%d bloggers like this: