3 ms·
Noob here so forgive my ignorance but I thought a light-year was a unit for measuring distance, not time.
by bsd44 5y ago
Noob here so forgive my ignorance but I thought a light-year was a unit for measuring distance, not time.
- ben_w 5y agoIt is. Light travels one lightyear per year. Although, when you have to account for anything in relativity, the expansion of the universe included, you have to be pedantic about what you mean by both distance and time because they’re both observer-dependent, albeit in a way that keeps the speed of light itself a constant.