Science's Greatest Mysteries S01E05 - Is There Life on Mars?

Could the proof of life on the Red Planet help us to better understand life on ours? In 1996, the scientific community was rocked by the discovery of a meteorite. The object appeared to come from Mars and researchers claimed there were traces of fossils inside. The controversial find suggested that there was life on the planet, but others were far more skeptical. As Martian exploration has intensified, proof of life there could help us understand how life on Earth was established.