Possible Martian microfossil

Possible Martian microfossil

. This image, taken with a scanning electron microscope, shows an unusual structure located in a carbonate globule within meteorite ALH 84001 from Mars. The tube-like feature in the center of the image is only about 200 nanometers, or 0.0000002 meters, long, which is about one hundredth the width of a human air. It appears segmented, as if it were a filament composed of separate elements. The minute structure looks like some very small, fossilized bacteria found on Earth. Some scientists interpret it as a possible Martian microfossil of exceedingly small bacteria that may have lived on Mars about 3.6 billion years ago. Other scientists dispute this interpretation. (Courtesy of NASA and JPL.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University