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Not a very sensible conversion. a gegametre, 1 Gm, is one billion metres; a millimetre , 1mm,is one one thousandth of a metre.

1 Gm = 1 000 000 000 m; 1 mm = 0.001 m.

1 mm = 1 x 10-12 Gm

200 mm = 200 x 10-12 Gm, 0.000 000 000 200 Gm.

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13y ago

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