Eukaryote Heat Limit Expanded

Researchers have described a eukaryotic microbe (Incendiamoeba casadensis) that grows and divides at temperatures up to ~145°F (≈63°C), demonstrating eukaryotic cellular systems can function at far higher temperatures than assumed. This empirical result widens the known thermal envelope for complex, nucleus‑bearing life and invites rethinking of ecological, evolutionary, and astrobiological constraints. — If eukaryotes can tolerate much higher heat, that changes search strategies for extraterrestrial life, alters biosafety and monitoring assumptions for geothermal sites, and creates opportunities for thermostable eukaryotic enzymes in industry.