Is there anything in the universe that doesn't have gravitational mass? My understanding is that both rest mass and "relativistic mass" are gravitational masses, i.e. both are subject to the force of gravity. Further everything must have at least one or the other (if not both). Anything that doesn't have rest mass must move at the speed of light in order to exist in our universe. This in turn gives it a relativistic mass.(adsbygoogle = window.adsbygoogle || []).push({});

Is my reasoning correct? (be gentle))

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# What doesn't have gravitational mass?

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