For astronauts' safety, NASA limits the amount of radiation an astronaut can absorb over their career. Becoming an astronaut NASA has declared that upcoming missions to the moon will include a woman and a person of color, setting two firsts for lunar astronauts. "The astronaut corps is, of course, NASA's most visible workforce", says Lori Garver, who was NASA's deputy administrator from 2009 to 2013. Features When astronaut Eugene Cernan stepped from the moon's surface into his spacecraft in December 1972, he was aware it was the end of an era. [Extracted from the article]