Petametre
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A petametre (American spelling: petameter, symbol: Pm) is a unit of length equal to 1015 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