Rivers began pumping weathered material into the sea about a billion years after Earth formed, suggesting continents may have gotten an early start.
"It's pretty surreal to walk between two major pieces of Earth's crust that are drifting in different directions," Brooke ...
One photographer put the age of starlight into perspective with stunning projections on some of Earth's oldest rock ...
A square-shaped formation on Mars, about 3 kilometers wide, has generated interest and speculation. NASA's Mars Global ...
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