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Photons are effected by gravitational fields not because photons have mass, but because gravity changes the shape of space-time.
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Photons are effected by gravitational fields not because photons have mass, but because gravity changes the shape of space-time.
Its gravity (due to its mass) is what effects the light. If light had no mass, there would be no gravity effect.
That is why it curves, but not why it would fall to the gravity of the black hole.
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Things fall into a black hole because space time in a black holes area is extremely warped. They are responding to the curvature in space time, not the gravitational field...
Thats the way I understand it. Light must, at least, have a very, very small mass else it would not be affected by gravity.
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http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/961102.html
Now, being scientists, we do not just accept theories like general relativity or conclusions like photons have no mass. We constantly test them, trying to definitively prove or disprove. So far, general relativity has withstood every test. And try as we might, we can measure no mass for the photon. We can just put upper limits on what mass it can have. These upper limits are determined by the sensitivity of the experiment we are using to try to "weigh the photon". The last number I saw was that a photon, if it has any mass at all, must be less than 4 x 10-48 grams. For comparison, the electron has a mass of 9 x 10-28 grams.
Now, being scientists, we do not just accept theories like general relativity or conclusions like photons have no mass. We constantly test them, trying to definitively prove or disprove. So far, general relativity has withstood every test. And try as we might, we can measure no mass for the photon. We can just put upper limits on what mass it can have. These upper limits are determined by the sensitivity of the experiment we are using to try to "weigh the photon". The last number I saw was that a photon, if it has any mass at all, must be less than 4 x 10-48 grams. For comparison, the electron has a mass of 9 x 10-28 grams.
Thats the same concept of gravity. A large mass, such as a planet warps space time and thus pulls things to it (gravity). In a black hole its just warped MUCH more than by a planet sizeed mass.
I have discussed this in depth with a professor friend of my parents, he spent his entire professional life trying to disprove the theory of General Relativity, to no success, but he still belives that the theory has its holes, he just has not been able to prove it. He is retired not and is a amature astronomer, not to be confused with an astrologist. Very interesting guy to talk with. Very strange guy, but knows a lot about the phisical world we live in, he can blow your mind.
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Eisteins relativity was all about how light would be effected by gravity in a universe where it had no mass. This was literally how he proved his theory.
The curvature in space time is what gravity is... It's like saying, "when people are hit by a car they are responding to its velocity, not how fast it is going."
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Well good luck to him.
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His wording, not me.
Thats what I said, just better worded...!
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It doesn't matter. The fact is, light is lensed because of warping in space time, which effects light particles.
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The result is the same, but to get a full understanding of the physical world we need to understand why, not just that it is.
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really...how so?
1 John 1:5 (King James Version)
5This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.