Toxic Mars: Astronauts Must Deal with Perchlorate on the Red Planet

The pervading carpet of perchlorate chemicals found on Mars may boost the chances that microbial life exists on the Red Planet — but perchlorates are also perilous to the health of future crews destined to explore that way-off world.
Perchlorates are reactive chemicals first detected in arctic Martian soil by NASA’s Phoenix lander that plopped down on Mars over five years ago in May 2008.