Eli5: If a laser is shined into space will it continue to infinity (if it doesn’t hit a solid object)?

Question

Seems like a gargantuan, if not infinite amount of energy would be required for this to occur

In: 10

Answer 1

Not really, friction is what stops any object in your everyday experience from doing this. Push a ball in space and it will also move forever if it isn’t effected by another body (gravity or otherwise)