![]() ![]() Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types. ![]() You can find metric conversion tables for SI units, as well as English units, currency, and other data. More specifically, a light year is defined as the distance that a photon would travel, in free space and infinitely far away from any gravitational or magnetic fields, in one Julian year (365.25 days of 86400 seconds each).Ĭ provides an online conversion calculator for all types of measurement units. (The nearest star known is Alpha Centauri, 4.3 light-years away, with a parallax of about 0.75.). It stands for "parallax of one arc second", and is approximately 19,131,554,073,600 (19 trillion) miles.Ī 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 (nearly six trillion) miles). The parsec (symbol pc) is a unit of length used in astronomy. The definition of a parsec is as follows: A light-year (ly) is the distance that light, traveling through a vacuum with a speed of 186 000 mi/s, would cover in 1.0 year. A parsec (pc) is the distance at which a length of 1 AU would subtend an angle of exactly 1 second of arc. ![]() The SI prefix "giga" represents a factor of An astronomical unit (AU) is equal to the average distance from Earth to the Sun, about 92.9×10 6 mi. Light year to Gpc, or enter any two units below: Enter two units to convert From: To measure the vast distances in space, astronomers use. Light traveling in a vacuum moves at a velocity of 186,282 miles per second (299,792,458 meters per second) thus one light-year is equal to about 5.88 trillion miles (9.46 trillion kilometers). F.1.5 Relative Distances edit edit source The average. This means that it would take 4.3 years to send a message to Proxima Centauri. Example: The distance to the nearest star (Proxima Centauri)from the Earth is 4.31 light years, which is equal to 1.3pc. You can do the reverse unit conversion from In astronomy, the distance that light travels in one year is called a light-year. One light year is equal to 9.46 x 1015m, which is also equal to 0.3068 Parsecs(Pc). ![]()
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