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Originally posted by Ixtab
en.wikipedia.org...
How light is bent by gravityedit on 20-2-2012 by Ixtab because: (no reason given)
Originally posted by ILikeStars
sometimes i sit and ponder. sometimes i just sit. sometimes i just ponder.
could consciousness be a byproduct of the singularity....
Originally posted by coyote66
If photons do not have mass, why does light bend when passing near a star? (observed at an eclipse)edit on 20-2-2012 by coyote66 because: (no reason given)
Originally posted by mbkennel
Originally posted by coyote66
If photons do not have mass, why does light bend when passing near a star? (observed at an eclipse)edit on 20-2-2012 by coyote66 because: (no reason given)
Why is it necessary for photons to have mass in order for their paths to be bent?
Honestly, I'm astonished at the fervent Acceptance of Ignorance on this thread. Does not anybody know any physics at all? I
Here's a hint. There was this german guy called Albert. He figured it all out.
In a nutshell:
*) light does not have mass, but it does have momentum and and energy density and hence a pressure
*) this means that light (electromagnetic fields) does indeed work as a source of gravitation along with mass. In practical terms, this effect is very small and cannot be measured on Earth, but has some effect on the cosmology of the universe.
*) gravitation affects the geometry of space time which affects all laws of physics and their observations.
*) there is a specific quantitative theory which has been upheld by experiments and observations for almost a century
*) quantum mechanics is not necessary in the above.
edit on 20-2-2012 by mbkennel because: (no reason given)edit on 20-2-2012 by mbkennel because: (no reason given)
Originally posted by andersensrm
No sorry dude I didn't know that. Always thought that the source of gravity only came from mass, but I guess a pressure wave can create gravity?
I know light bends with gravity, but isn't this because space is bending?
Originally posted by smithjustinb
Is it possible that light creates gravity? Photons travel at 300,000 km/s and bombard the earth. Wouldn't something travelling at that speed and hitting any object, regardless of light's masslessness have some kind of effect?
If light had mass, travelling at 300,000 km/s, it would hurt when it hit. But since it doesn't have mass, it's bombardment doesn't hurt, but it doesn't let you jump very high either.
When light comes into contact with matter, it hits it at 300,000 km/s and reflects at 300,000 km/s. Imagine what this looks like at the atomic level. In order for light to reflect and maintain its speed, It must first be absorbed by a body and then re-emitted. So, I can see how electrons might actually grab on to the light, whip it around the nucleus of the atom and then launch it back into space. At the point of the electron's acceleration, (in order to maintain light speed constant) and at the point of the electron's down to earth (no pun intended) direction, gravity is created. The electron would only speed up to light speed on its downward motion. As the light being held by the electron returns to the surface, the light lets go of the electron and the electron returns to its base speed.
Every atom has electrons that has a magnetic repulsive effect on the electrons in close proximity. When one electron moves in one atom, so do the electrons in the adjacent atom. This is how light creates gravity even on the dark side of the earth. Gravity is actually the electron's accelerating influence on the atom as it travels downward to the earth or to the center of the body.
There's a lot more to it, and a lot of calculations to be made, to completely describe the process, but we can let the rest of that unfold in the following discussion.
Originally posted by 1ncegreat
I'm sorry but that is flawed thinking that has been disproved by the fact that when its night time you and everything else don't just float up and away.
Originally posted by andersensrm
reply to post by xacto
How do you mean by that, how are the waves not moving??