ИСТИНА

Jupiter's satellite Europa is believed to have a subsurface ocean that might be a potential environment for the existence of extraterrestrial life. the data from the Hubble Space Telescope provide possible evidence for water plumes being ejected from the ocean to space and permanently renewing the icy surface of Europa. In this case, hypothetical microorganisms could be ejected from the ocean and frozen in the surface ice layer during thed of time at a very low temperature in the water eruption events. These potential life forms might remain in a dormant state for the an undetermined extended period of time at a very low temperature inside the surface ice layer. The viability of microorganisms after millions of years of cryoconservation should be limited by impact of ionizing radiation. We calculated irradiation rates depending on ice thickness, and performed irradiation (with accelerated electrons) of Deinococcus radiodurans, Arthrobacter polychromogenes, and Methylobacterium sp. embedded into a model of Europa's ice under simulated temperature and pressure conditions of Europa