Space is dirty. Filthy. It's littered with asteroids, and rocks, and dust. Some of that material falls to the Earth. When it enters the atmosphere, we call it a meteor. If it lands, it's a meteorite. Meteorite collectors gather in Cincinnati this weekend. They'll show off what they have and talk about how they got it.

Meteorites come in all shapes and sizes, but to collectors they’re all special.

John Ventre usually keeps his locked away in a safety deposit box, but he does bring them out occasionally.

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He holds a silvery slice of jagged space rock against the light. It's about 6 by 4 inches, and an eighth of an inch deep.

"And what's neat about this particular one is… you can see pieces of olivene, which are translucent green gems."

Ventre, who's in his 90

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