BLACK HOLE
Black Hole Structure
Although black holes come in a variety of masses and sizes, their structures are all alike. A black hole's entire mass is concentrated in an almost infinitely small and dense point called a singularity.
This point is surrounded by the event horizon - the distance from the singularity at which its escape velocity exceeds the speed of light.
Space-Time deformation
black holes that get deformed, because of other black holes or stars crashing into them, are known to emit a new sort of radiation, called gravitational waves, which Einstein predicted nearly a hundred years ago.
Gravitational waves are ripples in the fabric of spacetime that travel at the speed of light but they are extremely difficult to detect.
Why Black?
Photons always travel at the speed of light, but they lose energy when travelling out of a gravitational field and appear to be redder to an external observer. The stronger the gravitational field, the more energy the photons lose because of this gravitational redshift.
The extreme case is a black hole where photons from within a certain radius lose all their energy and become invisible. Indeed, light in the vicinity of such strong gravitational fields exhibits quite bizarre behavior .
OTHER DIMENSIONS
Does another dimension exist?
According to physisists, Black holes are basically a dead star which produces billion times more gravitational force than it would have ever had during its life cycle as a star.
Hawking's opinion
Stephen Hawking predicted that black holes evaporate through a quantum process known as "Hawking evaporation" and can explode in brief bursts of energy before vanishing completely Cosmic flares shot from exploding black holes could provide long-sought proof of extra spatial dimensions, new calculations suggest.
The Einstein-Rosen Bridge
In 1916 Einstein first introduced his general theory of relativity, a theory which to this day remains the standard model for gravitation. Twenty years later, he and his long-time collaborator Nathan Rosen published a paper[1] showing that implicit in the general relativity formalism is a curved-space structure that can join two distant regions of space-time through a tunnel-like curved spatial shortcut.
