eli5 – if photons have no mass, how can they be used to push hypothetical “solar sails”?

Question

eli5 – if photons have no mass, how can they be used to push hypothetical “solar sails”?

In: 20

Answer 1

Things with mass can be thought of as light travelling in a circle, even if it doesn’t spin around to trigger your object recognition and object permanence, it is still energy moving in a direction.