One challenge astronauts face as they prepare for a mission to Mars is that they haven’t got a thing to wear.
For example, astronaut Andrzej Stewart had to wear a hazmat suit during his training at the Mars simulation center on Hawaii known as HI-SEAS. That suit just wasn’t realistic.
The problem is, it’s too expensive to build actual Mars space suits just to train on Earth. A fully functional Mars suit would cost millions of dollars to build. Plus, it would be extremely heavy. (Mars has 62 percent lower gravity than the Earth.)