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radio wave → CapableOf → travel at the speed of light	0.78
photon → CapableOf → travel at the speed of light	0.76
gravitational wave (subgroup of wave) → CapableOf → travel at the speed of light	0.59
muon → CapableOf → travel at the speed of light	0.59
laser → CapableOf → travel at the speed of light	0.58
energy → CapableOf → travel at the speed of light	0.54
wave → CapableOf → travel at the speed of light	0.46
neutrino → CapableOf → travel at the speed of light	0.44
signal → CapableOf → travel at the speed of light	0.44
energy (aspect of sun) → CapableOf → travel at the speed of light	0.41
proton → CapableOf → travel at the speed of light	0.40
electricity → CapableOf → travel at the speed of light	0.30
lightning → CapableOf → travel at the speed of light	0.30
radiation → CapableOf → travel at the speed of light	0.30
beam → CapableOf → travel at the speed of light	0.28
atom → CapableOf → travel at the speed of light	0.25
ripple → CapableOf → travel at the speed of light	0.25
gravity (aspect of black hole) → CapableOf → travel at the speed of light	0.25
gravity (aspect of planet) → CapableOf → travel at the speed of light	0.25