15 Clues That Earth Life May Have Come from Space

10. Isotopic Anomalies in Earth’s Oldest Rocks

Some of Earth’s oldest rocks contain isotopic anomalies that don’t match typical terrestrial processes.
These unusual signatures may point to materials delivered from space—possibly by meteorites or comets—early in our planet’s history. Such findings, highlighted in Science Magazine, add weight to the theory of extraterrestrial contributions to Earth’s early environment.