Black holes don't emit light, they trap it; and ordinarily, you can't see anything behind a black hole.
Black holes are dark, dense regions in space where the pull of gravity is so strong that nothing can escape. Not even light can get out of these regions. That is why we cannot see black holes—they are invisible to our eyes. Because nothing can get out of black holes, physicists struggle understanding these objects.
Black holes are regions in space where an enormous amount of mass is packed into a tiny volume. This creates a gravitational pull so strong that not even light can escape. They are created when giant stars collapse, and perhaps by other methods that are still unknown.
Black Holes Were Such an Extreme Concept, Even Einstein Had His Doubts. Einstein's theory of relativity paved the way for black holes' discovery, but the concept behind their existence was so bizarre that even the scientific visionary was not convinced.
Called quantum fluctuations of the vacuum. According to quantum mechanics. A given point in space-time fluctuates.
The term dark matter was coined in 1933 by Fritz Zwicky of the California Institute of Technology to describe the unseen matter that must dominate one feature of the universe—the Coma Galaxy Cluster.
Scattered across the universe, black holes are objects with gravity so powerful, nothing can escape their grasp. These objects can tear apart whole stars and planets.
Black hole news: Standing on edge of black hole would cause 700 years to pass in 1 minute.
No material that falls inside a black hole could survive intact. Unfortunately, because nothing can escape a black hole's event horizon — not even information — we'll never know for certain what happens when matter falls past the point of no return.
ECG Sudarshan and his colleagues suggested that if the said particles were created initially with the help of faster-than-light speed during particle collisions, there will be no need of acceleration or infinite energy.
Roger Penrose (left) proved black holes are real objects. Andrea Ghez (center) and Reinhard Genzel (right) showed that one weighing 4 million times as much as the Sun lurks in the heart of our galaxy. Since Penrose's advances, astronomers have found a wealth of evidence for black holes.
There is no way a black hole would eat an entire galaxy. The gravitational reach of supermassive black holes contained in the middle of galaxies is large, but not nearly large enough for eating the whole galaxy.
A star has survived a close encounter with a black hole, but the black hole has been able to sneak a second bite. A captured star has experienced multiple close encounters with a supermassive black hole in a distant galaxy — and possibly even survived having material ripped away by immense gravitational tidal forces.
In this sense, at least, there is a deeply religious side to physics. In this sense, physics at its best is an adventure in spirituality. But back to dark matter. My point is not that dark matter is God, although it may well be an embodiment of God.
Dark energy may destroy itself and decay. It may convert into baryonic matter or even birth a brand-new particle. Because we don't understand how it is made, we also do not know how to destroy it.
Eventually, in theory, black holes will evaporate through Hawking radiation. But it would take much longer than the entire age of the universe for most black holes we know about to significantly evaporate.
Over time they shrink down to nothing and simply pop away in a flash of energy. It's not exactly fast. A good size black hole — say, a few times more massive than the sun — will take about 10^100 years to eventually evaporate through this process, known as Hawking Radiation.
Going faster than the speed of light
Astronomers agreed that the black hole was spinning really fast, but obviously not as faster than the speed of light — the universal speed limit.
It implied that black holes break the fundamental time symmetry of physics, destroying information and preventing, even theoretically, the reversal of a sequence of events from the future back to the past. This has become known as the black hole information paradox.
That's true for everything from decaying uranium to fission bombs to nuclear fusion in the Sun to matter-antimatter annihilation. The amount of mass you destroy becomes energy, and the amount of energy you get is given by E = mc2.
The result E=mc^2 seems to be correct, but Einstein's calculation is incorrect. The error is in his use of the Lorentz transform. This transform was introduced to explain a faulty measurement by Michelson and Morley, but it fails to do what it was expected to do.
Black holes are scary for three reasons. If you fell into a black hole left over when a star died, you would be shredded. Also, the massive black holes seen at the center of all galaxies have insatiable appetites. And black holes are places where the laws of physics are obliterated.
The short answer, unfortunately, is no. White holes are really just something scientists have imagined — they could exist, but we've never seen one, or even seen clues that one may exist. For now, they are an idea. To put it simply, you can imagine a white hole as being a black hole in reverse.
However, it is extremely unlikely for several reasons. First and foremost, space is so incredibly vast that everything is located extremely far away from everything else: it is quite possible that a black hole has never come within 100 light-years of our sun, which is nowhere near close enough to consume it.
This energy takes the form of a slow-but-steady stream of radiation and particles that came to be known as Hawking radiation. With every bit of energy that escapes, the black hole loses mass and thereby shrinks, eventually popping out of existence altogether.