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50 years ago, NASA sent two spacecraft—Viking 1 and Viking 2—to search for life on Mars. These groundbreaking missions carried biology labs onboard and conducted the first-ever experiments directly on Martian soil. One test hinted at possible microbial life… but others didn’t agree. Then came a twist: a chemical in the soil may have destroyed the very evidence Viking was searching for.

Half a century later, scientists are still debating what the Viking missions really discovered. Did we already find life on Mars—and just not recognize it?

Watch now to uncover the fascinating story of NASA’s Viking missions and the mystery that still grips the scientific world.
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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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