The best fit for the observed actinide abundances was a neutron star collision about 1,000 light-years from the Solar System (so, inside the Milky Way galaxy), roughly 100 million years before the Earth formed, when the gas cloud that became the Solar System was still in the process of coalescing.
"If a comparable event happened today at a similar distance from the solar system, the ensuing radiation could outshine the entire night sky," Márka said.
This event, their research found, sprayed elements out into the surrounding space, contributing 70 percent of the early Solar System's curium, and 40 percent of its plutonium. Because of radioactive decay, there is much less of it now, 4.6 billion years later.
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