Mystery #4Tier 3space / universe / expansion
Is the whole universe really getting bigger, and if so, bigger into what?
Everything that has ever existed, every star, planet and galaxy, sits inside the universe. Astronomers say the universe is getting bigger every single second. But that leads to a dizzying question: if the universe is everything there is, then what on Earth is it growing into?
Your guess
What do you think is happening to the universe, and to the space inside it?
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.