The study found that a bacterium is not afraid of ultraviolet rays and can survive in harsh space environment for three years

Experiments by Japanese researchers have found that a bacterium can survive in harsh space conditions for at least three years, providing a way to study the origin of life on earth. The experiment was carried out jointly by Tokyo Pharmaceutical University and Japan Aerospace Research and development agency, the website of Japan Broadcasting Association reported on the 26th. The researchers placed a special bacterium outside the international space station, 400 kilometers from earth, in a vacuum, exposed to intense ultraviolet radiation, and experiencing a huge temperature difference between 29 degrees Celsius and – 42 degrees Celsius. < / P > < p > the bacteria adhere to the floating dust in the earth’s atmosphere and are highly resistant to radiation. Only a few percent of the bacteria survive in space, the report said. After three years of “living” outside the international space station, the surviving bacteria were brought back to earth for cultivation and reproduction. Other previous experiments have shown that spores can survive in space without ultraviolet radiation, and the latest experiment is the first to confirm that microorganisms can survive in space under ultraviolet radiation, according to Akihiko Yama, an emeritus professor at Tokyo Pharmaceutical University who led the experiment. NHK quoted Shanan as saying that the experimental results show that organisms may move in space alive, which helps to study the hypothesis that life on earth comes from other planets. Yama also told AFP that this shows that the bacteria may survive the journey between Mars and earth. His team hopes to do similar experiments in the Van Allen radiation belt outside the earth, so that the bacteria can withstand stronger radiation tests. The Van Allen belt is a radiation belt composed of high-energy particles. The inner zone is 650-6300 km above the earth, and the outer zone is 10000-65000 km above the earth. High energy particles in Van Allen band are harmful to manned spacecraft and satellites. New product launch