According to astrophysicist Steinn Sigurdsson, "There are viable bacterial spores that have been found that are 40 million years old on Earth—and we know they're very hardened to radiation."
Podľa astrofyzika Steinna Sigurdssona, existujú životaschopné endospóry staré 40 miliónov rokov, a je známe, že sú odolné voči žiareniu.