Sometimes, groundbreaking discoveries come from the most unexpected places—like a university desk drawer.
That’s exactly what happened with the Lafayette Meteorite, a small piece of Martian rock that has helped researchers piece together a chapter of Mars’ geological history.
A Meteorite’s Journey
About 11 million years ago, a massive asteroid smashed into Mars, launching debris into space.
One of these fragments began an interplanetary journey, eventually getting pulled into Earth’s orbit. After entering our atmosphere, the meteorite landed in Indiana. By 1929, the rock ended up stashed in a desk drawer at Purdue University’s biology department.
Fast forward to the 1980s, when the Lafayette Meteorite was donated to Chicago’s Field Museum.
There, scientists matched gases trapped in the rock to Mars’ atmosphere, thanks to data from NASA’s Viking spacecraft.
Initial analyses even hinted that the meteorite once interacted with water—but when and how remained a mystery.
Unlocking a 742-Million-Year-Old Secret
Recently, Purdue University researchers revisited the meteorite using cutting-edge isotopic dating techniques. Their findings, published in , revealed that the rock came into contact with liquid water around 742 million years ago.
But this doesn’t mean Mars was a planet of lakes and rivers at the time. According to Marissa Tremblay, assistant professor and lead researcher, the water likely came from melting permafrost triggered by volcanic activity beneath the surface.
Accounting for Space Travel
Given the meteorite’s long and dramatic journey, researchers had to rule out any contamination that might have altered its chemical signature.
Tremblay explained that the dating process factored in potential heating from its ejection off Mars, the 11 million years it spent in space, and its fiery descent through Earth’s atmosphere.
The results confirmed the meteorite’s watery history remained intact.
Looking Ahead
This study not only sheds light on Mars’ past but also sets the stage for future research. The same techniques could help analyze other meteorites or even provide clues about water on different planets.
Who knows? The next big discovery might still be sitting in another forgotten drawer!
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