Why is the sky black at night?
Deacon Tuck from Tyne and Wear (Age 5-14)
If all the stars in the universe give off light why isn’t it always light?
Tom from Essex (Age: 5-14)
If there are as many stars as it is recognised there are, and each one is in a relatively finite position and emits a discrete amount of light energy, let’s say, just 1 photon per second, why is the sky dark at night?
Martin Hedges from Greater London (Age 55+)