Why does meteor shower happen to originate in the same area i.e radiant of the meteor shower?

Question

I have read that meteor showers happen because earth passes through the debris left by the comets. If this is the case shouldn’t they be visible across the whole sky right from dusk to dawn?

In: Physics

Answer 1

The debris that the Earth still passes through is stuff that we’re just skimming the edge of. Anything that would do more was already picked up by the Earth long ago.