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Environment that formed the Earth.
To better understand the environment that formed the Earth, Purdue researchers are studying 29 meteorites that formed in our planet's neighbourhood. scientists believe the Earth collided with a Mars-sized planet early on, which changed its chemical makeup (and helped to form the Moon). These meteorites formed at the same time as the Earth, but they avoided this cataclysmic collision, so they can offer clues which were wiped clean from our planet.
Scientists working to understand the nature of the universe have developed some interesting theories that propose we have many more dimensions curled up inside the three we're comfortable with. A pair of researchers have done the math to calculate how the universe could shape up after the Big Bang, and found that it favours three and seven dimensions. In a seven dimension Universe, gravity would diminish greatly with distance, and planets would have difficulty forming stable orbits around stars.
A supernova that exploded 41,000 years ago might have led to the extinction of mammoths, according to researchers at Berkeley Lab. They found ancient mammoth bones peppered with iron-rich grains that had been travelling at 10,000 km/second. These grains might have been emitted from a supernova that exploded about 250 light-years away from Earth. It's also possible that debris from the supernova coalesced into comet-like objects; one could have struck the Earth about 13,000 years ago.
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