What exactly is a black hole?

Ben DavisApril 30, 2021

What exactly is a black hole?

A black hole is an area of space with a gravitational field so strong that nothing, not even light, can escape it. That’s why black holes appear black. In some cases, black holes are former massive stars that have been crushed to an extreme density during supernova explosions.

What is beyond a black hole?

They’re only visible when they’re feeding on stars or gas clouds that stray too close to their boundary, called the event horizon. Beyond the event horizon lies a truly minuscule point called a singularity, where gravity is so intense that it infinitely curves space-time itself.

Does time exist in a black hole?

For outside observers, a black hole is one solidary element, and there is no proper time inside the black hole, but there is only the observed coordinate time according to our spacetime coordinates.

Could our Sun become a black hole?

No. Stars like the Sun just aren’t massive enough to become black holes. Instead, in several billion years, the Sun will cast off its outer layers, and its core will form a white dwarf – a dense ball of carbon and oxygen that no longer produces nuclear energy, but that shines because it is very hot.

What is the heaviest thing in the universe?

So massive stars become neutron stars – the heaviest things in the universe – and even more massive stars become black holes.

Can humans go into a black hole?

They are most certainly not hospitable and would make traveling into the black hole extremely dangerous. To enter one safely, you would need to find a supermassive black hole that is completely isolated and not feeding on surrounding material, gas and or even stars.

What is the most expensive thing in the universe?

An astroid named 16 Psyche, after Cupid’s wife, was found to be made almost entirely of iron and nickel. That means, in current US markets, 16 Psyche is worth somewhere around $10,000 quadrillion (the world’s economy is around $74 trillion).

What is the most feared thing on earth?

Top 10 Things People Fear Most

Going to the dentist.
Snakes.
Flying.
Spiders and insects.
Enclosed spaces Fear of enclosed spaces, or claustrophobia, plagues most people, even those that would not readily list it as their greatest fear.
Mice.
Dogs.
Thunder and Lightning.

Why can’t you see a black hole?

The idea of an object in space so massive and dense that light could not escape it has been around for centuries. Scientists can’t directly observe black holes with telescopes that detect x-rays, light, or other forms of electromagnetic radiation.

What is the slowest thing in the universe?

Xenon-124

Is anything faster than light?

In special relativity, it is impossible to accelerate an object to the speed of light, or for a massive object to move at the speed of light. However, it might be possible for an object to exist which always moves faster than light.

Why does time stop at the speed of light?

Space itself is shortened and time itself is slowed down for a moving reference frame, relative to the stationary observer. In the limit that its speed approaches the speed of light in vacuum, its space shortens completely down to zero width and its time slows down to a dead stop.

Does time exist for light?

Well, not for light. In fact, photons don’t experience any time at all. From the perspective of a photon, there is no such thing as time. It’s emitted, and might exist for hundreds of trillions of years, but for the photon, there’s zero time elapsed between when it’s emitted and when it’s absorbed again.

How long would it take to go 4 light years?

There are 6 trillion miles in a light-year (approximately), so the distance we need to go is 6 trillion miles / light-year times 4 light-years, or 24 trillion miles. So, this trip would take 1.2 billion hours. There are 24 hours a day and 365.25 days per year, so this time in years is 137 thousand years.

How long would it take to go 4.2 light-years?

about 6,300 years

How fast can we travel in space?

300,000 kilometers per second

How fast is a light year?

In a vacuum, light travels at mph (1,km/h). To find the distance of a light-year, you multiply this speed by the number of hours in a year (8,766). The result: One light-year equals 5,000 miles (9.5 trillion km).

How far is Earth in light years?

about 6 trillion miles

Who discovered the speed of light?

Ole Roemer

How many light years can we travel?

It’s been 13.8 billion years since the Big Bang, which might lead you to expect that the farthest objects we can possibly see are 13.8 billion light-years away. But not only isn’t that true, the farthest distance we can see is more than three times as remote: 46.1 billion light-years.

Social studies

What exactly is a black hole?

Ben DavisMarch 21, 2019

What exactly is a black hole?

A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.

What is black hole and how it is formed?

Stellar black holes form when the center of a very massive star collapses in upon itself. This collapse also causes a supernova, or an exploding star, that blasts part of the star into space. Scientists think supermassive black holes formed at the same time as the galaxy they are in.

What is a black hole for kids?

A black hole does not have a surface, like a planet or star. Instead, it is a region of space where matter has collapsed in on itself. This catastrophic collapse results in a huge amount of mass being concentrated in an incredibly small area.

How dangerous is the black hole?

These black holes are dark most of the time, but when their gravity pulls in nearby stars and gas, they flare into intense activity and pump out a huge amount of radiation. Massive black holes are dangerous in two ways. If you get too close, the enormous gravity will suck you in.

What happens if you go inside a black hole?

If you jumped into the black hole feet first, the gravitational force on your toes would be much stronger than that pulling on your head. Each bit of your body would also be elongated in a slightly different direction. You would literally end up looking like a piece of spaghetti.

Where is the nearest black hole?

‘The Unicorn’ lies a mere 1,500 light-years from us and is just three times more massive than the sun. Astronomers have apparently found the closest known black hole to Earth, a weirdly tiny object dubbed “The Unicorn” that lurks just 1,500 light-years from us.

Can you see a black hole?

You can ‘see’ the closest known black hole to Earth with the naked eye. There is a black hole in our backyard. Astronomers have found the closest black hole yet at just 1000 light years from Earth, close enough to see the stars that orbit it without a telescope.

How fast does a black hole travel?

110,000 mph

Can a black hole spin faster than 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. “One of the unbreakable laws of physics is that nothing can move faster than the speed of light,” said Brad Snios, another co-author of the study.

Why does a black hole spin?

Rotating black holes are formed in the gravitational collapse of a massive spinning star or from the collapse or collision of a collection of compact objects, stars, or gas with a total non-zero angular momentum. In late 2006, astronomers reported estimates of the spin rates of black holes in The Astrophysical Journal.

Can light travel faster than itself?

For one thing, while nothing has ever been observed travelling faster than light, that does not mean it is not theoretically possible to break this speed limit in very special circumstances. Take, for instance, the expansion of the Universe itself.

Philosophy

What exactly is a black hole?

Ben DavisFebruary 19, 2019

What exactly is a black hole?

What would happen if a black hole hit the sun?

If a black hole like Cygnus X-1 were to stray near the Solar System, within a light-year or so, its gravity would cause chaos. The orbits of the outer planets and comets would be significantly and possibly disastrously altered, and this would in turn threaten the orbits of the inner planets and even the Sun.১৯ অক্টোবর, ২০১৮

How big does a black hole need to be to destroy Earth?

D Astrophysics, University of Leicester, said a 1mm black hole would still have a mass of 10 percent that of Earth. If it was to hover on Earth’s surface, its gravitational pull would cover a third of the planet, tearing it up at 12 kilometres per second.২১ নভেম্বর, ২০১৯

What if a black hole the size of a coin?

The Earth would be destroyed, but the whole planet would not be swallowed up by the black hole. A black hole with a Schwarzschild radius of about a centimeter, which would make it about the size of a coin, would have about the same mass as the Earth.১০ ফেব, ২০১৪

What happens if a black hole comes to Earth?

If a black hole were to form from the Earth itself, it would create an event horizon just 1.7 centimeters in diameter. Eventually, some time later, any object at rest — no matter how far away from the event horizon it initially was — will cross that horizon and encounter the central singularity.১৫ অক্টোবর, ২০২০

What happens if a person goes into a black hole?

What would happen if we nuked a black hole?

It would not visibly explode, and it would only explode in a future when the entire universe had faded in to darkness. Note that near a black hole the intensity of matter falling in to the black hole is swirled around with a ferocity similar to a nova explosion.

Why does time stop at a black hole?

Near a black hole, the slowing of time is extreme. From the viewpoint of an observer outside the black hole, time stops. Inside the black hole, the flow of time itself draws falling objects into the center of the black hole. No force in the universe can stop this fall, any more than we can stop the flow of time.

How can we close a black hole?

But according to our definition of black holes, the only way to escape one is to travel faster than light, so if information does escape, it must be doing so superluminally, in conflict with locality.১ ডিসেম্বর, ২০১৯

What can destroy a galaxy?

Black holes might kill entire galaxies with blazing energy,dooming embryonic stars before they can get born and condemning the remainingstars to a slow death, scientists have found.৪ মে, ২০১০

What is a safe distance from a black hole?

seventy miles

What is more powerful than a black hole?

A neutron star can be at most about three times the mass of the sun, black holes are nearly all larger than that, so the gravitational pull of the black-hole is greater.

Are quasars dangerous?

Explanation: The closest quasar to Earth is about 2,000 light years away. So despite the fact that it put out around 1,000 times as much energy as the sun, it is simply too far away to be dangerous.২৪ নভেম্বর, ২০১৫

What is the largest black hole in the universe?

quasar TON 618