What Is a Light-Year? (It’s Not Time, and That’s the Point)
Ask someone what a light-year is and you’ll usually get “a really long time.” It isn’t. What is a light-year is one of the most common mix-ups in all of science: the word “year” is sitting right there in the name, doing nothing but confusing you. A light-year is a distance. Specifically, it’s how far … Read more