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Ancient moon volcanoes made tiny glass beads. Here's what they mean.

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Tiny glass beads brought back by NASA 's Apollo 17 astronauts are helping scientists uncover new clues about how the moon erupted billions of years ago .

They found a kind of mineral powder — so fine you need microscopes to see it — formed as the beads flew through giant gas clouds during eruptions.

The findings suggest the moon had a much more dynamic history of volcanoes than previously known.