| 41. | The theoretical upper limit is determined by the speed of light.
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| 42. | The latter travels at the speed of light in the vacuum.
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| 43. | They have widths of several percent of the speed of light.
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| 44. | Electromagnetic information about the charge travels at the speed of light.
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| 45. | He summarized hints that the speed of light might vary over cosmic time.
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| 46. | Where is the speed of light and is the energy density.
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| 47. | You know how Einstein said the speed of light is constant?
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| 48. | Fermat also argued in support of a finite speed of light.
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| 49. | The finding also raises questions about whether the speed of light is really constant.
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| 50. | We need to drop a postulate, perhaps the constancy of the speed of light.
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