to the general theory of relativity, a black hole is a region
of space from which nothing, including light, can escape. It is
the result of the denting of spacetime caused by a very compact
mass. Around a black hole there is an undetectable surface which
marks the point of no return, called an event horizon. It is called
"black" because it absorbs all the light that hits it, reflecting
nothing, just like a perfect black body in thermodynamics. Under
the theory of quantum mechanics black holes possess a temperature
and emit Hawking radiation through slow dissipation by anti-protons.
have identified numerous stellar black hole candidates, and have
also found evidence of supermassive black holes at the center
of every galaxy. After observing the motion of nearby stars for
16 years, in 2008 astronomers found compelling evidence that a
supermassive black hole of more than 4 million solar masses is
located near the Sagittarius A* region in the center of the Milky
a wormhole is a hypothetical topological feature of spacetime
that would be, fundamentally, a "shortcut" through spacetime.
A wormhole is, in theory, much like a tunnel with two ends each
in separate points in spacetime. In 1935, Albert Einstein and
Nathan Rosen in 1935 first dreamed up the idea of a wormhole.
They realized that general relativity allows the existence of
“bridges,” originally called Einstein-Rosen bridges but now known
as wormholes. These space-time tubes act as shortcuts connecting
distant regions of space-time.
A white hole,
in general relativity, is a hypothetical region of spacetime which
cannot be entered from the outside, but from which matter and
light may escape. In this sense it is the reverse of a black hole,
which can be entered from the outside, but from which nothing,
including light, may escape. (However, it is theoretically possible
for a traveler to enter a rotating black hole, avoid the singularity,
and travel into a rotating white hole which allows the traveler
to escape into another universe.
short video about black holes and worm holes taken from
a show called the universe.
"Through the Wormhole" hosted by Morgan Freeman on Wednesdays
at 10pm only on Science Channel. http://www.sciencechannel.com
physics, a wormhole is a hypothetical topological feature
of spacetime that is fundamentally a 'shortcut' through
space and time. Spacetime can be viewed as a 2D surface
(to simplify understanding) that, when 'folded' over, allows
the formation of a wormhole bridge.