Our food, water, power, and communications were limited, and we were only allowed to exit the habitat if we wore mock spacesuits. This was the first Hi-Seas mission - a third starts this month - and it was designed mainly to study the types of food Mars explorers might eat. I was the crew writer, and since I had the scientific background and interest, I conducted a sleep study, too.
Cosmonaut Elena Serova and two male colleagues blast off from Baikonur cosmodrome, Kazakhstan, last month. Photo / AP
One device we used to track sleep was a sensor armband, which also provides estimates of daily and weekly caloric expenditure. Over time I noticed a trend. Week-in, week-out, the three female crew members expended less than half the calories of the three male crew members. We were all exercising roughly the same amount - at least 45 minutes a day for five consecutive days a week - but our metabolic furnaces were calibrated in radically different ways.
During one week, the most metabolically active male burned an average of 3450 calories per day, while the least metabolically active female expended 1475 calories per day.
The calorie requirements of an astronaut matter significantly when planning a mission. The more food a person needs to maintain her weight on a long space journey, the more food should launch with her. The more food launched, the heavier the payload. The heavier the payload, the more fuel required to blast it into orbit and beyond. The more fuel required, the heavier the rocket becomes, which it in turn requires more fuel to launch. Every pound counts on the way to space. Nasa was keenly aware of this and that's why in the early 1960s it nearly considered a female astronaut corps.
Of course, politics and culture have a pesky way of sneaking into engineering decisions, especially when a country's pride is on the line, according to Margaret A Weitekamp, author of Right Stuff, Wrong Sex: America's First Women in Space Program.
Despite extensive training and excellent performance, the women in the programme were dismissed. Some of the reasons included fears about public relations if female astronauts were killed, as well as Nasa's reliance on military pilots, who at the time were only male.
Elena Serova, Russia's first female cosmonaut in almost two decades. Photo / AP
The first woman in space was cosmonaut Valentina Tereshkova of the Soviet Union, who flew 20 years before Sally Ride. Her flight bolstered the appearance of communist egalitarianism during the Cold War. Russia hasn't kept up a female presence in orbit, though; it only just last month launched its first female cosmonaut in almost two decades, Elena Serova.
Indeed, a number of people I talked to acknowledged the benefits of an all-female crew, or even just a crew made of smaller people in general. One proponent is Andrew Rader, a mission integrator at SpaceX. "Anything to reduce weight and even in terms of making the spacecraft seem bigger, having smaller astronauts would be great," he says. "I think it's a reasonable proposal."
As reasonable as an all-female Mars mission is from an economic perspective, some might find the idea offensive. After all, it'd be an expedition that fails to represent half the world's population; an all-female Mars crew would strike many as exceptionally biased.
Then again, space-mission design has always been biased in one way or another. Exploration in general is nothing if not political, dictated by the people with the money and power to choose the face of the expedition. Right now, it's unlikely that those with the power to do so would agree to fund a crew of small female astronauts even to save money.
Still, if the bottom line is what matters in getting to Mars, the more women the better.
- Independent
