The discussion revolves around the concepts of light's mass and the notion of "Gravity Speed," which is suggested to be a speed faster than light and instantaneous. Participants explore the implications of these ideas in the context of physics, questioning established notions of mass and gravity propagation.
Participants express differing views on the nature of light's mass and the concept of Gravity Speed. There is no consensus on these topics, and the discussion remains unresolved.
The discussion includes references to theoretical concepts and interpretations that may not be universally accepted or experimentally verified. The implications of mass associated with light and the propagation speed of gravity are presented with varying degrees of certainty.
Originally posted by Guard
My math teacher was talking to me about how NASA weighed light. If it doesn't have any mass, how is this possible? Also, he was saying that they are beginning to study a speed faster than the speed of light. Called Gravity Speed. Which has no lag, and is instantaneous. Do any of you know about these?
Originally posted by Guard
My math teacher was talking to me about how NASA weighed light. If it doesn't have any mass, how is this possible? Also, he was saying that they are beginning to study a speed faster than the speed of light. Called Gravity Speed. Which has no lag, and is instantaneous. Do any of you know about these?
The full page can be read atWe are perhaps not used to thinking of electromagnetic radiation as having mass, but it is well-known that radiation has energy density. If the energy density is denoted by u, then special relativity implies that the electromagnetic radiation has a mass density [tex]\rho[/tex] given by
[tex]\rho = u/c^{2}[/tex]
To my knowledge nobody has ever actually "weighed" electrogmagnetic radiation in any way, but the theoretical evidence in favor of Eq. (7.3) is overwhelming - light does have mass. (Nonetheless, the photon has zero rest mass, ...)