Light Year (ly)
Definition: A light-year (ly) is the distance light travels in one Julian year (365.25 days), approximately 9.461 trillion kilometers or 5.878 trillion miles. It is used for measuring astronomical distances.
History: The term 'light-year' was first introduced in the 19th century to help astronomers express cosmic distances. It replaced astronomical units that were cumbersome for measuring vast space distances.
Current Use: Light-years are used in astronomy to describe distances between stars, galaxies, and other celestial objects. It is crucial for understanding the scale of the universe and cosmic events.
Petameter (Pm)
Definition: A petameter (Pm) is a unit of length equal to 10^15 meters, used for measuring large cosmic distances such as the size of galaxies and nebulae.
History: The petameter was introduced to simplify extremely large measurements in astronomy, allowing researchers to express vast distances in a comprehensible unit.
Current Use: Petameters are used in astrophysics when discussing galaxy clusters, intergalactic distances, and space phenomena on an enormous scale.
Quick Conversion Table Light Year (ly) to Petameter (Pm)
1 Light Year (ly) equal to 9.4605284 Petameter (Pm)
5 Light Year (ly) equal to 47.302642 Petameter (Pm)
10 Light Year (ly) equal to 94.605284 Petameter (Pm)
20 Light Year (ly) equal to 189.210568 Petameter (Pm)
30 Light Year (ly) equal to 283.815852 Petameter (Pm)
50 Light Year (ly) equal to 473.02642 Petameter (Pm)
75 Light Year (ly) equal to 709.53963 Petameter (Pm)
100 Light Year (ly) equal to 946.05284 Petameter (Pm)