There are plenty of challenges to putting people on Mars, whether you look at the rocket, the astronaut or the planet itself.
By Meghan Bartels | SPACE.com
Cosmic radiation is made up of incredibly tiny particles moving incredibly fast, nearly at the speed of light — the sort of phenomenon a human body isn’t very well equipped to withstand. That radiation travels across all of space, but Earth’s atmosphere buffers us from the worst of its impacts. That means the farther away from Earth’s surface you go, the more cosmic radiation your body absorbs. [Space Radiation Threat to Astronauts Explained (Infographic)]