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I often hear this but it clashes with my understanding of relativity. Can someone explain how relativity "breaks down" at the event horizon?

Is it because we see back in time to before stars formed and thus there is no more stars beyond that point? or is it because space is expanding at the hubble constant and when you reach the horizon space expands at the speed of light so we cannot see past it?

Light Cone a surface in space-time, represented as a cone in three dimensions, comprising all the points from which a light signal would reach a given point (at the apex) simultaneously, and that therefore appear simultaneous to an observer at the apex. but Einstein concluded that...

In the center of the earth, the force due to the upper half of the Earth cancels the force due to the lower half at the center of the Earth. Similarly, any force due to any portion of the Earth at its center will be cancelled by the portion opposite to it. As a result, the gravitational force at...

I read that the milky way is headed toward the great attractor. If the great attractor is in front of us, Is our solar system in the front half or back half of the milky way?

What if H=v/d where v = delta d/ delta t where delta d = delta L where delta L = L - L' where L = L * sqr(1-(v/c)^2) // (Lorentz contraction ) and L' = L' * sqr(1-(v'/c)^2) where v = velocity relative to the CMB ~600km/s where v' = v + a*delta t where a = acceleration rate...

I read our local cluster is moving ~600km/s relative to the CMB. At the same time we are orbiting the galaxy at ~250Km/s so depending on the orientation and motion, relative to the CMB we could be changing from 350km/s up to 850km/s and then back down to 350km/s every rotation about 250k...

the closer to a black hole you get the more gravitational time dilation. Since the SoL is constant, and speed = d/t. Since time is dilated by gravity there would a discrepancy between a distant observers SoL and a close one. Wouldn't that make the Event horizon size relative to your...