Supernovae are the spectacular explosions that result from dying massive stars, seeding the universe with heavy elements like carbon and iron. Kilonovae occur when two binary neutron stars begin circling into their death spiral, sending out powerful gravitational waves and stripping neutron-rich matter from each other. Then the stars collide and merge, producing a hot cloud of debris that glows with light of multiple wavelengths. It’s the neutron-rich debris that astronomers…

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