Mystery #1Tier 1space / distance / light
A light-year sounds like a stretch of time, so why is it really a distance?
You've probably heard that a star is 'a thousand light-years from Earth' or that a spaceship is 'four light-years away'. It sounds like you are counting years, the way you count birthdays or school terms. But a light-year is not an amount of time at all. So what is it actually measuring?
Your guess
What do you reckon a light-year really measures?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.