Hey everyone. I'm kind of new to the whole physics world, but I've got a question I've been wondering about. So the Sun attracts the Earth because of gravity (or bends space time that the Earth is traveling through), and my question is this: Since photons have momentum, and momentum must be conserved when the photons strike the Earth, how much collectively are the photons pushing the Earth away from the Sun? Obviously it must be very little, but does it cause even a noticable error when calculating the orbit of the earth? That is, if the sun did not emit light, would it appear as though it's gravitational pull has gotten stronger than when it -was- emitting light? Maybe a dumb question, but something I was pondering...thank you!