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Gravity bending due to another Gravitational Source

  1. Aug 22, 2011 #1
    Does the effect of Gravity get bent like light around another gravitational source? If the object is close enough to the Earth does the Earth's gravitational force bent the Moon's or even the Sun's gravitational effect on that object before that "line of sight" event occurs. As Einstein's General Relativity was proven in 1919 with an solar eclipse of the Sun, light bents with a gravitational source why can't gravity.

    Will a Satellite around Earth in Low Earth Orbit feel the Gravitational pull before passing from the protection of the Earth's Umbria or will it feel nothing until the Sun is directly in front of it? If so is there any mathematical evaluation of this occurrance?
     
  2. jcsd
  3. Aug 24, 2011 #2
    It doesn't make sense to describe a static gravitational field as being deflected by other objects (since deflection implies motion). A gravitational field that is changing in the right ways will produce gravitational radiation which (as long as they are sufficiently small in energy density and the deflecting object's gravity is not too strong at the point of closest approach) is deflected the same way as light.
    The static gravitational field of an object (such as that from the Sun that causes the Earth to orbit it) is not blocked by anything. When a satellite passes behind the Earth wrt the Sun the gravitational force on it is still the http://en.wikipedia.org/wiki/Vector_sum#Addition_and_subtraction" of the forces from the Earth and Sun. Note: considering gravity to be a vector force is only valid in the newtonian approximation, gravitational waves require general relativity and do not exist in newtonian gravity.
     
    Last edited by a moderator: Apr 26, 2017
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