Japanese scientists were able to prove that rare earth elements are made by looking at the spectra of light coming from neutron stars that were colliding.
, occurred in 2017. Despite this, except for strontium, recognized in optical spectra, scientists have struggled to pinpoint the precise elements produced during neutron star mergers.
A binary pair of neutron stars created the signal in their final moments of inspiral, which culminated in a merger. It is the first GW finding to be supported by non-gravitational methods. This finding was based on comparisons of detailed kilonovae spectra simulations produced by the National Astronomical Observatory of Japan's supercomputer "ATERUI II."Before now, scientists thought that rare earth elements existed based on how bright a kilonova got over time, not on its spectral properties.
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