Life Videos

Did Life Come To Earth On An Asteroid?

The video examines a recent study that subjected the extremophile bacterium Deinococcus radiodurans to pressures equivalent to those generated when an asteroid blasts rock fragments into space. By sandwiching the microbes between metal plates and firing a projectile, researchers recreated shock pressures of 1‑3 gigapascals—far exceeding the deepest ocean pressure—and measured survival outcomes. The results were striking: at roughly 1.4 GPa almost all cells remained viable, and even at 2.4 GPa about sixty percent survived. Microscopy showed intact membranes at lower pressures, while higher pressures caused damage that the bacteria repaired using DNA‑repair pathways. These findings echo earlier work showing the same strain enduring vacuum and cosmic radiation outside the International Space Station, and they align with the known resilience of tardigrades and other extremophiles. The study bolsters the lithopanspermia hypothesis, suggesting that microbial life could hitch a ride on rocks ejected by impacts and later seed neighboring planets. While interplanetary transfer appears plausible over millions of years, the video notes that interstellar journeys would require billions of years and are far less likely. If microbes can survive such extreme conditions, the possibility that Earth’s biosphere originated elsewhere—perhaps Mars—gains credibility, reshaping our understanding of planetary protection, astrobiology, and the broader search for life beyond Earth.