The Mars 2020 Perseverance Rover is collecting samples in search of signs of ancient microbial life, which would advance NASA's quest to explore the past habitability of Mars. The samples are set to return to Earth no earlier than 2031, as part of the Mars Sample Return campaign being planned by NASA and the European Space Agency. Before the rover went to space, NASA and its engineers worked hard to prevent Earth's microbes from contaminating Mars. Now, before the samples collected by the rover return to Earth, Florida Atlantic University is helping NASA design protocols for sterilizing Mars material and protecting our biosphere.