As for how the meteorite survived its long stint on Earth, researchers point to the ice age.
"The only meteorites that we know about that have survived these long ages are the ones that were collected in Antarctica," said Pillinger, adding that more recently, some ancient meteorites have been collected in the Sahara Desert. This rock came from neither the Sahara Desert nor Antarctica, but rather the Lake House in Wiltshire.
"Britain was under an ice age for 20,000 years," Pillinger told LiveScience, explaining the climate would have protected the rock from weathering.
At some point, the Druids likely picked up the meteorite when scouting for rocks to build burial chambers. "They were keen on building burial sites for [the dead] in much the same way the Egyptians built the pyramids," Pillinger said.
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Then, years later, an archaeologist with ties to other, famous archaeologists, likely found the rock while excavating the Druids' burial sites, he said. The archaeologist then brought the rock back to his house in Wiltshire, where its more recent residents took notice and alerted researchers.