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Marilyn Monroe
sang, "Diamonds are a girl's
friend". Scientists believe
have found an 18-km wide layer of these precious
, on Mercury. Earth's
neighbour could be a huge
. Researchers tested how Mercury formed from
clouds of
. Over 4.5
years ago, the dust became graphite. Mercury's diamonds may never be mined. This is because they are 500 km below Mercury's
.