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selfAdjoint
#2
Aug28-04, 08:32 AM
Emeritus
PF Gold
P: 8,147
No, this should be in a FAQ because it's such a common misconception. In general relativity gravity works on ENERGY and MOMENTUM. Mass is a form of energy, but only one form; any form will work, even kinetic energy!

And light does carry energy and momentum even though its quantum, the photon, is massless. This has ben observed experimentally.