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Gigametre
The
gigametre
(official spelling used by the
International Bureau of Weights and Measures
;
SI
symbol:
Gm
) or
gigameter
(American spelling) is a
unit
of
length
in the
metric system
, equal to
one billion
metres
, the
SI
base unit
of length, hence to 1,000,000
km
or approximately 621,370
miles
.
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