Apollo 15 astronauts collected tiny green glass beads from the Moon in 1971; more than 35 years later scientists found evidence of water inside, changing what we knew about the lunar interior

In 1971, Apollo 15 astronauts David Scott and James Irwin noticed something unusual on the Moon: tiny green flecks scattered across the otherwise grey surface. They collected samples and brought them back to Earth, unaware that the material would decades later challenge a long-held belief about the Moon.

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