The surface of Mars (IMAGE) University of California - Los Angeles Caption Yuri Shprits, a UCLA research geophysicist, said limiting the duration of a round trip to the red planet would help reduce the amount of dangerous radiation to which astronauts are exposed. Credit NASA Usage Restrictions Please credit NASA. 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.