Petametre
A
petametre
(
American spelling
:
petameter
, symbol:
Pm
) is a
unit
of
length
equal to 10
15
metres
. Petametres could be used for measuring
interstellar
distances, but astronomers have been long accustomed to using
light-years
(about 9.5 petametres) and
parsecs
(about 31 petametres) instead.
1 Pm is equal to 6685
AU
1
light-year
is equal to 9.46 Pm
1
parsec
is equal to 30.86 Pm
the distance to
Proxima Centauri
is 40 Pm
the distance to
Sirius
is 81 Pm
the distance to
Vega
is 237 Pm
light travels the distance of 1 Pm in 38.6 days (38
d
14
h
34
min
1
s
)
terametre
<<
petametre
<<
exametre
See also
1 E15 m
SI
SI prefix
Orders of magnitude
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