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In page Donald Pettit:
"Pettit also performed experiments on board ISS related to clumping of solid particles in microgravity. The experiments showed that particles of various materials which varied in size between 1 micrometer and 6 mm naturally clumped together in microgravity when confined to a volume of 4 liters that included a few grams of the materials. The cause was theorized to be electrostatic. This presents a plausible mechanism for the initial stages of planetary formation, since particles of this size do not have sufficient gravity to cause this phenomenon.[2][3]
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