Science Can astronauts safely go to Mars? Cosmic ray risk increasing.

If the sun is entering a prolonged period where sunspot activity is considerably weaker, the radiation hazard from cosmic rays is likely to increase further. A new study looks at the risks for astronauts going to the moon, Mars, and other destinations.

By , Staff writer

NASA/AP

Radiation hazards during trips to the moon, Mars, or other destinations outside the protective shield of Earth's magnetic field remain one of the most daunting challenges to human exploration beyond low-Earth orbit.