Space travel is dangerous, you guys.
Space travel can be pretty dangerous. The Space Shuttle Challenger or Columbia explosions come to mind, but technical failures aren't the only problem we face. One of the big ones we'll have to confront as we go forward with manned missions is the prospect of major radiation exposure during flight. Thanks to data from the Mars Science Laboratory, researchers have calculated the amount of radiation it received during its trip to Mars. The results? Not great unless you like the idea of having cancer.