Latest News About Black Holes

 

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A black hole is a location in space that possesses so much gravity, nothing can escape its pull, even light. Learn more about what black holes are and the latest news. Researchers at LIGO and. Sep 20,  · The Milky Way has a lot of black holes — about million of them, a new study suggests. But there’s no reason to fear. “It may sound like a big number, but by astronomical standards, it’s a pretty small number,” says Daniel Holz/ Most stellar black holes, however, lead isolated lives and are impossible to detect. Judging from the number of stars large enough to produce such black holes, however, scientists estimate that there are as many as ten million to a billion such black holes in the Milky Way alone.


What Is a Black Hole?


Nothing, not even light, can escape a black hole. Though black holes are invisible, black holes articles, they can create brilliant light shows. This illustration shows a black hole devouring a star. But say you do. A black hole isn't actually a hole.

If anything, it's the opposite. A black hole is a place in space containing a lot of stuff packed very closely together. It has accumulated so much mass — and therefore gravity — that nothing can escape it, not even light. As you approach black holes articles black hole, its gravitational pull gets stronger, black holes articles. That's true of anything with gravity, including the Earth and sun, black holes articles.

Before long, black holes articles, you pass a point called the event horizon. Every black hole has one. That's true whether the black hole has the mass of a single star or as much as the collective mass of millions and sometimes billions of stars.

An event horizon surrounds each black hole like black holes articles imaginary sphere. It acts like a boundary of no return. Since your feet are closer to the black hole's center, its gravity pulls stronger on your lower body than on your upper body. Look down: You will see your feet being drawn away from the rest of your body.

As a result, black holes articles, your body gets stretched, like chewing gum. Then things really start to get interesting. For instance, at the center of the black hole, everything — including your shredded self — collapses to a single point. Congratulations: Once there, you really have arrived! You also are on your own. Scientists have no idea what to expect once you get there.

Decades of study from a safe distance have taught scientists quite a lot. Those observations, including startling discoveries made in recent months, continue to add to our understanding of how black holes help shape the universe. The gravitational pull of an object depends on how much stuff it contains.

And just as with stars and planets, more stuff — or mass — comes with a greater force of attraction. They're dense, too. Density is a measure of how tightly mass is packed into a space. To understand how dense a black hole can be, imagine you could pack your own.

Start with a thimble. Fill it with black holes articles of your books you would need to really stuff them in. Add your clothes and any furniture in your room. Next, add everything else in your house, black holes articles. Then throw in your house too. Make sure to squeeze it all down to fit. Stuffing your thimble increases its density, its mass and its gravitational attraction.

The same is true with black holes. They pack a huge amount of mass into an incredibly small space. Imagine a black hole the size of New York City. It would have as much mass and gravity as the sun. That means this New York-sized black hole would be able to hold all eight planets and every other object in our solar systemjust as the sun does.

What the black hole wouldn't be able to do is gobble up the planets. That sort of idea gives black holes a bad rap, says Ryan Chornock. Sometimes, a star will get too close. In Maya telescope in Hawaii picked up a bright flare from a distant galaxy.

That blaze peaked a few months later, in July, and then faded away. A team of astronomers, including Chornock, identified this black holes articles as the last blast from a dying star being ripped apart by a black hole. As the remnants of the star fell toward the black hole, they became so heated that they glowed. So even black holes can create brilliant light shows — by eating stars.

Most black holes form after a giant star, black holes articles, one at least 10 times as massive as our sun, black holes articles, runs out of fuel and collapses. The star shrinks and black holes articles and shrinks until it forms a tiny, dark point. This is known as a stellar-mass black hole.

While much smaller than the star that made it, the black hole maintains the same mass and gravity, black holes articles. Our galaxy probably contains about million of these black holes. Astronomers estimate a new one forms every second. Note that small- and medium-sized stars, such as the sun, cannot form black holes. When they run out of fuel, they become small, planet-sized objects called white dwarfs. Stellar-mass black holes are the shrimps of the family.

They're probably also the most common. At the other end of the spectrum are giants called supermassive black holes. They probably have as much mass as a million — or even a billion — stars. These rank among the most powerful objects in the known universe. Supermassive black holes hold together the millions or billions of stars that form a galaxy. In fact, a supermassive black hole holds together our galaxy.

Again, nothing can escape a black hole — not visible light, X-rays, infrared light, microwaves or any other form of radiation. That makes black holes invisible. They do this by studying how black holes affect their surroundings.

For example, black holes often form powerful, bright jets of gas and radiation visible to telescopes. As telescopes have grown larger and more powerful, black holes articles, they have enhanced our understanding of black holes.

Hlavacek-Larrondo and her collaborators recently used data from NASA's Chandra space telescope to study the jets from 18 extremely large black holes. The size of the jet can be used to estimate the size of the black hole. That has led to some surprising findings. In Decemberfor instance, Hlavacek-Larrondo and other astronomers reported that some black holes are so big they deserve a new name: ultramassive. These black holes probably contain anywhere between 10 billion and 40 billion times more mass than does our sun.

Even five years ago, astronomers knew of no black holes with a mass above 10 billion times that of our sun, says Jonelle Walsh. With so much mass, the superstrong gravity of an ultramassive black hole can hold together entire clusters, or groups, of galaxies. They are so large that they must have slowly gained mass after first forming billions of years ago. Scientists are now starting to explore how black holes have been forming since the Big Bang.

How to build a big black hole isn't the only mystery. Supermassive black holes are connected, through gravity, to hundreds of billions of stars. Figuring out the link between a black hole and the stars it anchors is a dilemma. Which came first is a bit like the chicken and the egg question. Maybe the clustering came first. Last year brought yet black holes articles discovery that deepens the mystery about black holes. This galaxy lies more than million light-years away.

A light-year is the distance light travels in one year. Even though NGC is only about one-fourth the size of the Milky Way, black holes articles, Walsh and her colleagues reported in November that the black hole at its center is one of the biggest ever measured.

Black holes and galaxies are usually believed to grow black holes articles and stop growing — together. This new discovery suggests either this black hole just kept growing, by feeding on nearby stars and other black holes, or black holes articles was oversized from the very start.

Walsh says she wants to know if other galaxies have a similar arrangement — or even the opposite, with a small black hole at the center of a large galaxy, black holes articles. Black holes are some of the most extreme objects in the universe. Astronomers continue to find and observe more of their extreme members, including the biggest, smallest and strangest black holes out there. Explains Walsh: Those observations can help untangle the complicated relationships black holes have with stars, galaxies and clusters of galaxies.

Big Bang The cosmic expansion that marked the origin of the universe The gravity is so strong that not even light can escape. Most galaxies are believed to have a black hole at their center.

The more mass there is, the more gravity there is. It equals about 9.

 

Black Holes News -- ScienceDaily

 

black holes articles

 

May 29,  · Black holes are some of the most extreme objects in the universe. Astronomers continue to find and observe more of their extreme members, including the biggest, smallest and strangest black holes out there. Explains Walsh: Those observations can help untangle the complicated relationships black holes have with stars, galaxies and clusters of / Sep 21,  · Black holes are points in space that are so dense they create deep gravity sinks. Beyond a certain region, not even light can escape the powerful tug of a black hole's gravity. And anything that. A black hole is a location in space that possesses so much gravity, nothing can escape its pull, even light. Learn more about what black holes are and the latest news. Researchers at LIGO and.