Sending humans virtually anywhere in space beyond the Moon pushes logistics of health, food, and psychology to limits we're only just beginning to grasp.
animals, body temperature plummets, metabolism shrinks, and heart rate and breathing slow. This process can reduce energy expenditure by as much as 98 percent in some cases, removing the need to waste effort hunting or foraging.
Keeping with this scenario, we might imagine our intrepid space tourist tucked up in their specially-kitted bed would lose just over six grams of fat a day. Over a year, this would add up to around two kilograms of weight. From this, they concluded the daily energy expenditure of hibernating animals scales in a fairly balanced way, so a gram of tissue from a tiny mammal, like the 25-gram leaf-eared bat, consumes as much energy as a gram of tissue from an 820-gram hibernating ground squirrel.
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