"No place on Earth was
safe. Four billion years ago, during the Hadean eon, our Solar System was a
dangerous shooting gallery of large and dangerous rocks and ice chunks."
(The gif shows impacts over time: “Spatial distribution and sizes of craters formed on the early Earth. Each circle indicates the final estimated crater size; color coding indicates time of impact. Credit: Simone Marchi/SwRI.”)
Four Billion BCE: Battered Earth: http://apod.nasa.gov/apod/ap140805.html
Simone Marchi: http://www.boulder.swri.edu/~marchi/
rich pollett
(The gif shows impacts over time: “Spatial distribution and sizes of craters formed on the early Earth. Each circle indicates the final estimated crater size; color coding indicates time of impact. Credit: Simone Marchi/SwRI.”)
Four Billion BCE: Battered Earth: http://apod.nasa.gov/apod/ap140805.html
Simone Marchi: http://www.boulder.swri.edu/~marchi/
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