Which organism is known for its resistance to high radiation environments?

Extremophiles are organisms that can thrive (live) in extreme environmental conditions like high temperature, high pressure, low temperature, low salinity, and even in high radiations. 

Deinococcus radiodurans is an extremophilic bacterium known for its remarkable resistance to high levels of radiation. This bacterium is capable of surviving exposure to extremely high levels of ionizing radiation, such as those found in nuclear reactors or outer space. This resistance is due to the presence of multiple copies of its genome and a highly efficient DNA repair mechanism. Staphylococcus aureus is a common bacterium that can cause infections in humans, while Thermus aquaticus is a bacterium that is commonly used in molecular biology research for its heat-resistant DNA polymerase. Halobacterium salinarum is an extremophilic archaeon that can survive in high salt concentrations.