Scientists Gear Up to Look For Fossils on Mars

When most people imagine hunting for fossils, they probably think of finding dinosaur bones laid down in layers of rock. But the vast majority of life – and therefore fossils – across Earth’s history has been microorganisms. These tiny lifeforms, either plants, animals or fungi, can be smaller than the width of a human hair. But with the right tools, the fossilized records of these tiny creatures reveal insights into the history of a planet. Even planets that aren’t Earth.