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Hubble radius, Hubble sphere (not to be confused with a Hubble bubble), Hubble volume, or Hubble horizon is a conceptual horizon defining the boundary between particles that are moving slower and faster than the speed of light relative to an observer at one given time. Note that this does not mean the particle is unobservable; the light from ...
Jul 16, 2016 · Event horizon is the largest distance at a given time from which light can ever reach you. The difference from your definition is in its time dependence - it grows. Re.: 1) You can have a growing Hubble sphere in an accelerating universe (as is the case in ours).
Apr 30, 2021 · The Hubble sphere is an imaginary sphere centred on the Earth of radius 4,300 Mpc. If the Hubble parameter didn’t change over time, we could only see objects which emitted light today located inside the Hubble sphere. However the Hubble parameter is changing over time, so we need to consider a further type of horizon, the event horizon.
The particle horizon (also called the cosmological horizon, the comoving horizon (in Scott Dodelson 's text), 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. Much like the concept of a terrestrial horizon, it represents the boundary between the ...
The Hubble volume is approximately equal to 10 31 cubic light years (or about 10 79 cubic meters). The proper radius of a Hubble sphere (known as the Hubble radius or the Hubble length) is , where is the speed of light and is the Hubble constant. The surface of a Hubble sphere is called the microphysical horizon, [2] the Hubble surface, or the ...
Oct 10, 2024 · The first is the aforementioned Hubble sphere. The next is the particle horizon. This is the distance that light emerging at the Big Bang could have reached by a time after the the Big Bang, such ...
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The particle horizon represents a horizon of sorts. It is the `range of perception or experience' of photons upon the observer !. It is the sphere of our knowledge about the nature of the universe in this regard. We cannot see beyond the present particle Horizon, however it is expanding continuously in time.
