Life on earth can also live in space: bacteria survive successfully outside the international space station for three years

Although people have been longing for space life, they can only stay in space for a long time relying on the international space station. But some microbes from earth can survive in space for years without protection. According to foreign media reports on August 27, a new study published by scientists from Tokyo University in Japan shows that some bacteria from the earth can survive in space for several years, indicating that some interstellar travel may bring life to other planets. < / P > < p > scientists at the University of Tokyo placed dry particles of bacteria from Earth on the panels outside the international space station. These bacteria, called radioresistant cocci, were exposed to cold and radiation filled vacuum without protection. < / P > < p > after one year, two years and three years, we found that all the bacterial particles with thickness greater than 0.5 mm were partially alive. Through further research, it is found that the survival of bacteria is due to the death of the outermost layer of bacteria to form a protective layer, thus protecting these bacteria eventually survive. < / P > < p > using the data collected annually, the team was able to infer how long bacterial particles of different thicknesses would eventually survive in space. Bacteria that are about 0.5 mm thick can survive 15 to 45 years outside the ISS, while bacteria over 1 mm can float freely in space and survive for more than eight years. < / P > < p > the researchers said that this suggests that some interstellar travel may bring some microbes to other planets, which also brings a new direction to the discovery of extraterrestrial life, even in environments that we think are impossible to survive. It is known that Deinococcus radiodurans is an extreme microorganism. In 1956, Anderson, an American scientist, was first isolated from a meat can which was still deteriorated after sterilization with 4kgy ionizing radiation. It was recorded by “Guinness World Records” and praised as “the most tenacious bacteria in the world”. It has become an ideal model organism for DNA damage repair. The research and utilization will also open up a new way for the bioremediation of radioactive and heavy metal pollutants, the research of radiotherapy and anti-tumor drugs, and the research of cell aging. Science Discovery