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quote:Originally posted by daveshortsIf light reflects off something it's momentum will change, to do this it must have had a force applied to it. In fact twice as much force as if it had just stopped. I am not sure if that answers your question.
quote:Space scientists want to take advantage of this effect, by building huge reflective solar sails which are pushed around the solar system by sunlight. This is a tiny force, but it keeps on going for ever, and you don't need to carry your own fuel, which means that a solar sail can be much faster than a conventional rocket if you have to go a long way.
quote:Originally posted by time-copso what i see in the mirror isnt me,its light reflecting off me and other objects around me,so really ive just answered my own question,the light does weigh something,albiet a very finite amount.now im going to have to go away and think about this one,and see if i can find another intelligent question,thank you all.http://www.armybarmy.org