Did a comet strike Earth 55 million years ago? Glass spheres suggest impact may have triggered past global warming
Around 55 million years ago, Earth experienced a series of sudden and extreme global warming events, known as the Paleocene-Eocene Thermal Maximum (PETM).
Little is known about the causes of this warming period, but a new discovery could shed more light on this period in the planet's history.
Researchers have now provided the first direct evidence that a comet struck Earth during this time – although it is unknown whether this occurred in relation to the warming period.
THE PALEOCENE-EOCENE THERMAL MAXIMUM The PETM occurred at the boundary between the Palaeocene and Eocene time periods... read more
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