COURTESY HT AUG 28

Space oddity: Bacteria that can survive 3 years in orbit

The horizon above the Earth as seen from the International Space Station. AP/ FILE
Agence France-Presse

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Tokyo : Scientists have found a radiation-resistant bacteria that can survive at least three years exposed in orbit, suggesting simple life forms could manage the long journey between Earth and Mars unprotected.

The Japanese scientists behind the research said on Wednesday the finding lends credence to so-called “panspermia theory”, which posits that microbes can travel from one planet to another, seeding life on arrival.

To test the theory, the researchers deposited a bacteria called Deinococcus radiodurans outside the International Space Station at an altitude of 400km from the Earth.

Despite enduring the harsh environment of outer space and exposure to strong UV and large temperature changes, the bacteria was still alive in parts after three years.

“I knew it would survive after carrying out various experiments in the lab, but when it came back alive, I was relieved,” Akihiko Yamagishi, study author and emeritus professor at Tokyo University of Pharmacy and Life Sciences, told AFP.

The results show that the bacteria could weather a journey between Mars and Earth.

“Everyone thinks the origin of life started on Earth, but the new findings indicate that other planets could also be where life began.” Yamagishi and his team hope to carry out similar experiments outside the Van Allen radiation belt, which would expose the bacteria to even more radiation.

The discovery, published Wednesday in the journal Frontiers in Microbiology, comes with Mars back in the headlines as three missions head for the Red Planet. afp