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…

5 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…

5 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.

5 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…

12 years ago