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[i]When OSIRIS-REx reached Bennu, it spotted something strange: some of the boulders had bright veins up to 150 centimetres long and 14 centimetres thick. These veins are too large to have formed on Bennu itself, says Hannah Kaplan at NASA's Goddard Space Flight Center in Maryland, so they were probably portions of larger cracks on Bennu's parent that were up to several kilometres long. "They suggest that there was fluid flowing on fairly large scales on Bennu's parent asteroid," says Kaplan. That is because the veins are made of carbonates, a type of compound that generally forms due to interactions between water and rock, she says.[/i]
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