Scientists have discovered evidence of various pollutant metals in Earth's stratosphere. They traced the metals back to rockets and satellites launched into space. The stratosphere contains the protective ozone layer. A team of researchers has found pollutant metals in Earth's stratosphere — the second layer of our atmosphere — and traced them back to rockets and satellites. When anything enters Earth's atmosphere, it's typically in a fiery blaze.

---

Persons: —, Dan Cziczo, Cziczo Organizations: Service, Purdue University, National Academy of Sciences