Mystery #1Tier 1Earth / space
Why do we have day and night?
Every day the Sun seems to rise, cross the sky and set, as if it's travelling around us. But the Sun isn't circling the Earth. So what's really turning day into night and back again?
Your guess
What's your hunch about what causes day and night?
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.