Mystery #1Tier 3starlight and colour
How can we possibly know what a star is made of without ever going there?
A star is so far away that its light takes years to reach us, and no rocket could ever fly there. Yet scientists can tell you a star is made mostly of hydrogen and helium, as confidently as if they had scooped up a jar of it. Nobody has ever flown out and grabbed a sample. So how can anyone possibly know what a star is made of?
Your guess
Have a go: how do you think we work out what a faraway star is made of?
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.