RE: How Cn Gravity Affect Light When Light Has No Mass?
March 2, 2018 at 1:57 pm
(This post was last modified: March 2, 2018 at 2:04 pm by Anomalocaris.)
(March 2, 2018 at 1:46 pm)Rhondazvous Wrote: This is the $50 million question
If gravity only affects objects that have mass and photons are massless, why does light curve around a planet or get trapped in a black hole?
Energy and mass are interchangeable directly, and for the purpose of gravity. Photons have energy, E=MC^2, hence photons have equivalent of mass.
Think of it this way, by E=MC^2, all forms of energy have equivalent of mass, and therefore are both affected by gravity, and exert their own gravity. If global warming heat the earth up, the gravity of the earth actually increase because the added kenetic energy of the molecules makes the earth slightly more massive.
If you annihilate a mass particle with its anti-partlcle, the mass of those two particles will convert into photons. If you somehow trap the photons so they don’t speed away, you will find the gravity well around the these photons remains exactly the same as before the annihilation.
