Home > Petametre

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)

See also: 1 E15 mTo help compare different distances this page lists lengths starting at 1015 m (1,000,000 million km). See also lengths of other orders of magnitude. Distances shorter than 1015 m 7 500 000 million km 50 000 AU Inner radius of Oort cloud 9 500 000 million, SIThe International System of Units (symbol: SI (for the French phrase Systeme International d'Unites , is the most widely used system of units. It is used for everyday commerce in virtually every country of the world except the United States, and it is uni, metre, SI prefixAn SI prefix is a prefix which can be applied to any unit of the International System of Units ( SI) to give subdivisions and multiples of that unit. As part of the SI system they are officially determined by the Bureau International des Poids et Mesures., Orders of magnitudeAn order of magnitude is the class of bigness, the class of size, the class of magnitude, of any amount, where each separate class contains ten times larger amounts than the one before. It is generally used to make very approximate comparisons. If two num, light yearA light year abbreviated ly is the distance light travels in one year: roughly 9. 46 × 1012 kilometres (9. 46 petametres, or about 5. 88 × 1012 miles). More specifically, a light year is defined as the distance that a photon would travel, in free space an, parsec