September 13, 2016
Early Earth's atmosphere weighed half as much
The conditions that prevailed on early Earth are, in many ways, as alien as those found on far off exoplanets. Some clues can be found in ancient …
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September 21, 2015
Ancient asteroids boiled Earth's oceans
The asteroid that wiped out the remaining dinosaurs — save for the avian variety — 66 million years ago was roughly 10 kilometers wide. Long …
May 14, 2015
Giant bolide hit South Africa 2.5 billion years ago
Some of the oldest scraps of continental crust on Earth cling to the southern tip of Africa and the western edge of Australia. In both places, …