Journey to Mars (1 of 2) (IMAGE) NASA/Johnson Space Center Caption This is an artist depiction of a satellite orbiting Mars. NASA scientists are studying ways to keep future astronauts safe from radiation on an exploration to Mars. Credit NASA Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.