MarsNews.com

Rethinking Viking: The Life on Mars Debate Rages On Space.com

In a quest to detect Martian life 25 years ago, the U.S. Viking 1 Lander plopped down, peeked about and poked the ground. Along with its later arriving twin, the robotic Vikings gulped down scoops of dirt, digesting the material in a kind of exotic microbial game of feast or famine.