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Old 10-12-2003, 03:42 AM   #25 (permalink)
CSflim
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Location: Ireland
Quote:
Originally posted by Lunchbox7
TIO, As I already said I am talking out of my arse ... As for the mass of light. Light is effected by gravitational forces. Gravity bends light so you can still see light if you are behind the dark side of a planet. It might not bend enough to be percieved as bright light but the human eye only needs to have one photon of light to be percieved. How can something wiht no mass be effected by gravitational forces which by definition only effects mass?
Common misunderstanding of physics.

Light is not bent by gravity.

Light always travels in straight lines. It APPEARS to be bent around massive objects...but it is not light which is bent in this case. It is 4-dimensional space-time being distorted by mass, not light being deflected. In three dimsnsions this makes it appear that light is bends.

As an analogy, let us project down from 4 dimensions to 3, as is the usual case when trying to imagine such matters.

Imagine you are on a hilly landscape, and you see a plane flying overhead. You now look at the planes shadow, passing along the hilly ground. Its path will appear to be bent. But at all times, the plane is traveling in a straight line.

Further more, if you are talking out of your arse, why bother to post? There are plenty of questions on this board, which I simply wouldn't have a clue how to answer, so I don't. Yuo have made it quite clear that you don't even understand classical newtonian physics, let alone relativity.
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