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Leading candidates are neutron star mergers and some types of supernovae. Wallner\n                    <jats:italic>et al.<\/jats:italic>\n                    analyzed the plutonium content of a deep-sea crust sample, identifying a few dozen atoms of the r-process isotope plutonium- 244 that were delivered to Earth within the past few million years. There was a simultaneous signal of iron-60, which is known to be produced in supernovae. Comparing the ratios of these isotopes constrains the relative contributions of supernovae and neutron star mergers to r-process nucleosynthesis.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Science<\/jats:italic>\n                    , this issue p.\n                    <jats:related-article issue=\"6543\" page=\"742\" related-article-type=\"in-this-issue\" vol=\"372\">742<\/jats:related-article>\n                  <\/jats:p>","DOI":"10.1126\/science.aax3972","type":"journal-article","created":{"date-parts":[[2021,5,13]],"date-time":"2021-05-13T15:15:35Z","timestamp":1620918935000},"page":"742-745","source":"Crossref","is-referenced-by-count":115,"title":["<sup>60<\/sup>\n                    Fe and\n                    <sup>244<\/sup>\n                    Pu deposited on Earth constrain the r-process yields of recent nearby supernovae"],"prefix":"10.1126","volume":"372","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2804-3670","authenticated-orcid":true,"given":"A.","family":"Wallner","sequence":"first","affiliation":[{"name":"Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia."},{"name":"Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, 01328 Dresden, Germany."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1938-8119","authenticated-orcid":true,"given":"M. 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