The average annual temperature on Mars is -64°F. At its hottest, Mars could hit 80°F near the equator in the middle of the day. In the Martian winter, however, temperatures could fall to -199°F.

That's why the first requirement for visiting the red planet would be a spacesuit.

But we were curious: How long could someone survive a summer day on Mars without all this fancy equipment, say, wearing only jeans and T-shirt and while holding his or her breath, which the average human can do for a little more than a minute.

The answer is, unsurprisingly, not very long.