Researchers have proposed that Earth may have had a ring system 466 million years ago, during a period of intense meteorite bombardment known as the Ordovician impact spike. This finding ...
Near-Earth asteroid Bennu has a slim chance of colliding with Earth in 2182. If it does, the impact could trigger a global ...
Over two hundred fifty million years ago ... and recede from one another at rates of 1-20 cm/year. They are driven by internal heat deep in the earth that is able to escape efficiently only ...
The collision was devastating: rocks from deep within Earth ... million years ago may have been bigger than today’s blue whales – and that they evolved astonishingly rapidly The asteroid hit ...
About 800 million years ago, oxygen levels reached about 21 percent and began to breathe life into more complex organisms. The oxygen-rich ozone layer was also established, shielding the Earth's ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback