VultureV1 Posted September 30, 2013 Share Posted September 30, 2013 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 ? Link to comment Share on other sites More sharing options...
Endy0816 Posted September 30, 2013 Share Posted September 30, 2013 Any massive object will bend light. Could probably just look up "gravitational lensing", otherwise someone should be along to explain more. Link to comment Share on other sites More sharing options...
swansont Posted September 30, 2013 Share Posted September 30, 2013 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. Link to comment Share on other sites More sharing options...
imatfaal Posted September 30, 2013 Share Posted September 30, 2013 ! Moderator Note Hijacking by adreamihavedreamt has been split off (as has the response) to the trash Please stick to the topic. Advertising a youtube video in another members thread is not acceptable Do not respond to this modnote Link to comment Share on other sites More sharing options...
VultureV1 Posted October 1, 2013 Author Share Posted October 1, 2013 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 ? Link to comment Share on other sites More sharing options...
Endy0816 Posted October 1, 2013 Share Posted October 1, 2013 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. 1 Link to comment Share on other sites More sharing options...
VultureV1 Posted October 1, 2013 Author Share Posted October 1, 2013 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 ?? Link to comment Share on other sites More sharing options...
swansont Posted October 1, 2013 Share Posted October 1, 2013 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) Link to comment Share on other sites More sharing options...
VultureV1 Posted October 1, 2013 Author Share Posted October 1, 2013 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 ? Link to comment Share on other sites More sharing options...
ccwebb Posted October 1, 2013 Share Posted October 1, 2013 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 Link to comment Share on other sites More sharing options...
Endercreeper01 Posted February 7, 2014 Share Posted February 7, 2014 Do you want to know the equations that describe how space-time is curved? Link to comment Share on other sites More sharing options...
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