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The first observation of a collision between neutron stars, detected in August 2017, created gravitational waves, light and heavy elements like gold and platinum. But astronomers have realized they also witnessed a kilanova, the kind of explosion that creates gold and platinum, the year before as well.
The 2017 observation offered evidence for the theory that such massive explosions in space are responsible for creating large amounts of heavy elements. All of the gold and platinum found on Earth was likely created by ancient kilanovae that resulted from neutron star collisions. Because astronomers were able to make a direct observation in 2017, it changed what they expected a kilanova to look like.
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