Just more universe that looks very similar to the universe we can see, almost certainly.
The cosmic event horizon isn't a physical thing where anything happens.
It is just the limit of what we can observe because we can't see things unless the light from them can reach us..
In astrophysics, an event horizon is a boundary beyond which events cannot affect an observer.
Wolfgang Rindler coined the term in the 1950s.
In 1784, John Michell proposed that gravity can be strong enough in the vicinity of massive compact objects that even light cannot escape..
The cosmic horizon might be defined as the furthest distance from which light can travel to an observer given perfect optical conditions and a wonderful telescope.
In a universe homogeneously and isotropically sprinkled with matter this distance, Rh should be the same in all directions..
The particle horizon, also called the cosmological horizon, the comoving horizon, or the cosmic light horizon, is the maximum distance from which light from particles could have traveled to the observer in the age of the universe..
The horizon problem describes the fact that we see isotropy in the CMB temperature across the entire sky, despite the entire sky not being in causal contact to establish thermal equilibrium.
Refer to the timespace diagram to the right for a visualization of this problem..
Answer and Explanation: We cannot see past the cosmological horizon because we can only see things in the night sky that produce (or reflect) light, and light takes time to travel to our eyes here on Earth..
This is due to the expansion of the universe, that space is expanding faster than light relative to us, and so any light emitted beyond this horizon can never reach us, even in infinite time..
The particle horizon (also called the cosmological horizon, the comoving horizon
The particle horizon differs from the cosmic event horizon
In an accelerating universe
While not technically "horizons" in the sense of an impossibility for observations due to relativity or cosmological solutions
• Killing
It turns out that cosmological horizons also have a temperature and emit matter and radiation because of a very similar effect
But because cosmological horizons surround us and the radiation falls inward, they reabsorb their own emissions and therefore do not evaporate away like black holes
In this sense, the cosmological horizon of an expanding FLRW space resembles more a white hole than a black hole event horizon
The cosmological particle horizon is a null surface
Proof(Cosmologists also speak of a particle horizon, which confusingly is often called a cosmological horizon as well
This refers to the distance beyond which light emitted in the early universe has not yet had time to reach us here on Earth
