4. Allan Hills Meteorite
Back in 1996, a group of astronauts made an announcement about a suspicious looking meteorite, now referred to as the Allan Hills Meteorite. It stirred a worldwide controversy because it was said to have come from Mars. They referred to this meteorite as evidence of fossilized microbial life on Mars and it led to speculation that Mars is similar to Earth. The issue was so big that even President Bill Clinton gave a national address. Since then, people have started to believe that we are not alone in the universe.
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