I hear the extreme gravity of black holes bend light ? Light is massless and F=GMm/3^2 , If m is 0 then the force of attraction is zero right ? so light should not be affected by gravity , I also heard people say that the force of gravity is not dependent on mass but is dependent on momentum and energy , but p = mv , and if m is zero p is zero . Can I haz an explanation ? is there some equation that says gravity is influenced by energy rather than mass ?

Any massive object will bend light. Could probably just look up "gravitational lensing", otherwise someone should be along to explain more.

I hear the extreme gravity of black holes bend light ? Light is massless and F=GMm/3^2 , If m is 0 then the force of attraction is zero right ? so light should not be affected by gravity , I also heard people say that the force of gravity is not dependent on mass but is dependent on momentum and energy , but p = mv , and if m is zero p is zero . Can I haz an explanation ? is there some equation that says gravity is influenced by energy rather than mass ?

 

GMm/r^2 (aka Newtonian gravity) is a pre-relativity approximation. In general relativity, which is more advanced and more complete, mass bends space, and light will deflect as a result. All mass does this. This was first confirmed in 1919, by Eddington observing the bending during a solar eclipse.

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GMm/r^2 (aka Newtonian gravity) is a pre-relativity approximation. In general relativity, which is more advanced and more complete, mass bends space, and light will deflect as a result. All mass does this. This was first confirmed in 1919, by Eddington observing the bending during a solar eclipse.

Wa ? Can you please explain how mass bends space ?

As an analogy, space-time is likened to a rubber sheet that matter is weighing down.

 

A picture might help.

 

 

 

Takes a perspective shift. Like how if you try to go "straight" on the Earth, your path actually turns out to be a circle.

So the gravitational field generated by mass bends the space time ? If that's the case , then causes a gravitational field to be generated in an object ? the atoms ??

Wa ? Can you please explain how mass bends space ?

 

Can I explain how it does it? No. Just as I can't explain how mass attracts mass under Newtonian gravity.

 

But everything behaves as if the geometry of space is curved, rather than flat, in the presence of energy*, of which mass is a form. (*technically it's energy-momentum)

 

Can I explain how it does it? No. Just as I can't explain how mass attracts mass under Newtonian gravity.

 

But everything behaves as if the geometry of space is curved, rather than flat, in the presence of energy*, of which mass is a form. (*technically it's energy-momentum)

So , the faster an object is traveling and the heavier it is the more it curves space ?

Yes.

 

http://www.hawking.org.uk/space-and-time-warps.html

 

http://curiosity.discovery.com/question/gravity-affect-time-space

 

http://www.youtube.com/watch?v=p_o4aY7xkXg

Do you want to know the equations that describe how space-time is curved?