The horizon of a black hole is called event horizon and is an astrophysical
phenomenon, which describes the “point of no return” where matter and even
light can not cross back according to our understandings of physics. The event
horizon is a boundary in spacetime, where the gravitational pull becomes
absolute.
Detailed Definition:
The astrophysical
phenomenon of the event horizon defines the boundary of spacetime, where the
ability of mass to deform spacetime is absolute.
Near this event
horizon time seems to work differently, because of gravitational time dilation,
which appears to slow down clocks near the horizon more than those farther away
and the clock would take an infinite amount of time to reach the black hole in
itself.
The huge amounts of gravitational pull causes
any light to redshift in a process called gravitational redshift. A clock
that is falling into a black hole would change from being visible from an
outside perspective, to the light of it red shifting and then finally it would
disappear from view and all this in a mere minute. On the contrary an
indestructible observer that falls into a black hole would experience time
normally and it would fall into the black hole in a finite amount of time.
Etymology:
Black hole term was coined in astronomy in 1964
Horizon Greekhorizon (kyklos) àboundary
Sample Sentence(s):
From an outside
perspective an object falling into the black hole horizon would take an
infinite amount of time to reach it.
The black hole horizon is the point of no
return, where matter or light are not able to cross back.
