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I know that mass can bend fabric of space-time, which causes gravity by making an object curve around a planet or star but is there anything else that can bend it?

Other energy sources, forces anything?

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In addition to mass (energy), tension and pressure can also act as sources for gravity. All the sources are encapsulated in an object called the energy momentum tensor as described here

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more simple terms? so does this mean mass and also energy can bend space-time? –  Nick1o2 Nov 2 '12 at 9:54
    
Yes energy, such as radiation, also acts as a gravitational source. –  twistor59 Nov 2 '12 at 11:50
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protected by Qmechanic Jul 31 '13 at 15:36

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