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1 .This is Scientific American's 60-Second Space. I'm John Matson. Got a minute?
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2 .Last week on the podcast we talked about space health.
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3 .Specifically, we told you about a new paper discussing the role that physicians will have to play in determining which citizens are fit enough for commercial jaunts into space.
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4 .Now let's leap ahead, and much farther afield.
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5 .What kinds of issues might a crew of astronauts face on a longer journey--say, a round-trip to Mars?
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6 .To find out, six volunteers spent a record 520 days confined to a simulated space habitat near Moscow.
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7 .They emerged in 2011.
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8 .Now a report in the Proceedings of the National Academy of Sciences shows that the simulated spaceflight did have real effects.
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9 .Removed from natural light and the rhythms of everyday life, four crewmembers experienced some type of sleep disturbance.
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10 .And one exhibited signs of chronic sleep deprivation in regular alertness tests.
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11 .Overall, the crew also became more sedentary with time.
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12 .The researchers conclude that a real Mars mission would need to incorporate tactics such as timed light exposure or exercise to keep astronauts' circadian rhythms on beat.
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13 .Because it would be a bad idea to land on Mars sleepy and out of shape.
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14 .Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.
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