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Boiling Blood and Radiation

Irene Klotz, 02/11/2019

5 Ways Mars Can Kill  

Radiation exposure is among the top health risks for Mars astronauts, but the Red Planet poses many other dangers as well.

The most immediate threat to human health on Mars is the low pressure of the planet's atmosphere, which is about 100 times thinner than Earth’s.

"If you are unprotected on Mars … your blood would boil, even at ambient temperature," said planetary scientist Pascal Lee, who's based at NASA's Ames Research Center and the SETI (Search for Extraterrestrial Intelligence) Institute, both in California.

"All the gases that are dissolved in your bloodstream [would] just turn into bubbles," he said during a webcast interview at the 2017 Humans to Mars Summit, which is underway this week in Washington, D.C.

"Like popping a can of Coke, you would fizz to death," Lee said. "And that's within seconds."

So low atmospheric pressure would kill an unprotected Mars explorer faster than anything else. The four other ways the Red Planet can get you, listed in chronological order, are, according to Lee:

1. Carbon dioxide atmosphere

Earth's atmosphere is about 78 percent nitrogen and 21 percent oxygen, with trace amounts of water vapor, carbon dioxide and other gases. By comparison, Mars' atmosphere is 95 percent carbon dioxide.

"We need to breathe oxygen," said Lee. "There's no free oxygen in the Martian atmosphere. You cannot breathe this gas. You would die of hypoxia within minutes."

2. Freezing temperature

During a summer day on Mars, the temperature at the equator can reach as high as 70 degrees Fahrenheit (21 degrees Celsius), but the nighttime temperatures are deadly. On average, the temperature plunges to about minus 80 degrees F (minus 62 degrees C).

"This is something that would kill you over the course of hours if you are not properly warmed," Lee said.

3. Dust

Mars is covered with toxic dust that is also finely grained and abrasive, and all of those traits are bad news for human lungs, Lee said. "You would die over the course of weeks if you were exposed to Martian dust," he said.

4. Radiation

The lack of a global magnetic field on Mars, coupled with the planet's thin atmosphere, means that high-energy cosmic rays and solar particles shower the Martian surface.

The long-term goal of the U.S. space program is a human mission to Mars in the mid-2030s, NASA has said. The agency is currently developing more than three dozen technologies to ensure human health and support science goals for exploration beyond Earth orbit.

 
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