light year
How Much Stuff is in a Light Year?
Determining how much stuff is a single light year is daunting, considering how big the Milky Way is. But doing…
7 years ago
How Far Does Light Travel in a Year?
Light travels at a speed of 299,792,458 m/s (1080 million km/h; 671 million mph), which works out to about 9,460.5…
7 years ago
Finite Light — Why We Always Look Back In Time
Light's finite speed make all gazing a ride in a time machine. Only a photon truly lives in the moment.
8 years ago
How Long is a Light Year?
A light year is the distance light can travel in vacuum in one year's time. This distance is equivalent to…
15 years ago