00:00NASA may have found signs of life on Mars.
00:02And we're still debating it today.
00:04In 1975, NASA launched Viking 1 and 2,
00:08twin spacecraft with one groundbreaking mission,
00:10Search for Life on Mars.
00:12They didn't just land on the red planet.
00:14They ran biology experiments right there on Martian soil.
00:18Viking ran three tests to see if microbes existed.
00:21One test showed possible signs of life.
00:24But two others? Not so clear.
00:26Then came the shocker.
00:27A separate experiment found no organic matter at all.
00:30Something no one expected.
00:32Turns out, Mars soil has perchlorate,
00:35a chemical that destroys organics when heated.
00:37So Viking might have burned away the very evidence it was looking for.
00:41Now, 50 years later, scientists are rethinking those results.
00:45Some even believe Viking may have found life, but didn't know it.
00:48What do you think Mars is hiding?
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