Previously, astronomers had been under the impression that the heavy elements?gold, platinum, lead, uranium, etc.?came from supernova explosions. But now, scientists have announced a new theory for these highly valuable elements, this one involving two ultra-dense neutron stars and one spectacularly violent, grossly expensive collision.
Source: http://gizmodo.com/all-the-gold-on-earth-comes-from-massive-space-explosio-827330159
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