A Nasa-backed study is exploring the feasibility of lowering the cost of a human expedition to Mars by putting the astronauts in deep sleep. The deep sleep, called torpor, would reduce astronauts’ metabolic functions with existing medical procedures.

“Therapeutic torpor has been around in theory since the 1980s and really since 2003 has been a staple for critical care trauma patients in hospitals,” said aerospace engineer Mark Schaffer, with SpaceWorks Enterprises in Atlanta, earlier this week at the International Astronomical Congress here.

So far, the duration of a patient’s time in torpor state has been limited to about one week.

Coupled with intravenous feeding, a crew could be put in hibernation for the transit time to Mars, which under the best-case scenario would take 180 days one-way, ‘Discovery News’ reported. “We haven’t had the need to keep someone in (therapeutic torpor) for longer than seven days. For human Mars missions, we need to push that to 90 days, 180 days,” Schaffer said.

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