The Book of Fluids

 

light years

Page history last edited by Joe 1 mo ago

The distance light travels in a year: about 9.461 × 1015 metres (9.461 petametres), or about 5.879 × 1012 (nearly six trillion) miles.

 

Just to get a sense of how big we're talking, let's use the Milky Way Galaxy as an example: the main disk of the galaxy is about 80,000 to 100,000 light years in diameter, about 250-300 thousand light years in circumference, and outside the Galactic core, about 1,000 light years in thickness.

 

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