What is the spherical boundary of zero thickness in which photons that move around black holes called? -Space

1 Answer

Answer :

A photon sphere or photon circle is an area or region of space where gravity is so strong that photons are forced to travel in orbits. (It is sometimes called the last photon orbit.) The radius of the photon sphere, which is also the lower bound for any stable orbit, is, for a Schwarzschild black hole:

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Description : What do we call the boundary around a black hole where nothing can escape its gravity? -Space

Last Answer : The boundary of the region from which no escape is possible is called the event horizon.

Description : If photons (light) have no mass, how can they be trapped by the gravitational field of a black hole? -Space

Last Answer : Although photons have no mass, they do have energy, and the gravity of a black hole (or any other gravitating body) will attract them. According to Einstein's theory of gravity, it is energy, not mass, that feels the gravitational force. That's the short answer

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Description : Some black holes, including the M87 black hole, shoot narrow “jets” of ionized matter away from the black hole at nearly the speed of light. How far do the jets from the M87 black hole extend? -Space

Last Answer : The M87 black hole's jets blast along its axis of rotation to a distance of roughly 5,000 light years.

Description : Since the area of event horizon increases as matter falls into it, do stellar black holes ultimately become supermassive black holes as time progresses? -Space

Last Answer : The existence of this black hole was first guessed at because the Messier87 galaxy when imaged at radio frequencies shows the signature twin-jets of plasma that are squirted out at near-relativistic ... matter, if one has telescopes with sharp enough vision, which the Event Horizon Telescope had.

Description : Can Black Holes burst if matter going into them exceeds a certain limit? -Space

Last Answer : A black hole's called its event horizon, defines the boundary where the velocity needed to escape exceeds the speed of light, which is the speed limit of the cosmos. But if the crushed core contains more than about three times the Sun's mass, no known force can stop its collapse to a black hole.

Description : In what manner does E=mc2, apply to black holes? -Space

Last Answer : E=mc2 applies to black holes just as it applies to any other phenomenon - i.e., whenever matter gets converted to energy or vice versa

Description : What kind of matter are black holes made up of, Solid, Liquid, Gas or Plasma? -Space

Last Answer : An object isn't necessarily heated to a plasma when it falls into a black hole. With quasars matter spirals down towards the event horizon so both it's speed and density increases, but this ... accretion disk is present) and is not anything specifically related to the presence of an event horizon.

Description : How can there be anything left in the universe? Don't black holes suck everything in? -Space

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Description : According to scientists, how many black holes exist? -Space

Last Answer : 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.

Description : What are the three sizes of black holes known as? -Space

Last Answer : There are four types of black holes: stellar, intermediate, supermassive, and miniature

Description : What can resist a black hole's gravity? -Space

Last Answer : Black holes are the blackest things in the universe. Because of their enormous, space-bending gravity, everything that falls into them is instantly ripped apart and lost. Scientists have never seen a black hole, because nothing, not even light, can escape them.

Description : Where are most supermassive black holes located? -Space

Last Answer : The monster black hole in galaxy cluster Abell 85 is roughly the size of our solar system, but packs the mass of 40 billion suns. The Abell 85 galaxy cluster, shown here, is home to the largest black hole known in the universe.

Description : How do we spot Black Holes? -Space

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Last Answer : After 1040 years, black holes will dominate the universe. They will slowly evaporate via Hawking radiation. A black hole with a mass of around 1 M ☉ will vanish in around 2 1066 years. As the ... black hole is proportional to the cube of its mass, more massive black holes take longer to decay.

Description : Could black holes be used as an energy source? -Space

Last Answer : Theoretically, a black hole could act as a power source, but it would not be nearly strong or reliable enough. A black hole with the mass of our sun would take half a trillion times the age of the universe to radiate enough energy to power a single light bulb.

Description : What is the best evidence for the existence of black holes? Is it all really just a theory? -Space

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Last Answer : Gravity wins out over the internal pressure of the star, because that pressure was produced by a normal, hot gas, and that gas is losing energy as the star radiates energy from the surface. The star may thus end up as a black hole.

Description : Where do super massive black holes likely exist? -Space

Last Answer : Astronomers believe that supermassive black holes lie at the center of virtually all large galaxies, even our own Milky Way. Astronomers can detect them by watching for their effects on nearby stars and gas. This chart shows the relative masses of super-dense cosmic objects.

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Last Answer : NOBODY has ever seen a black hole. Yet, despite this lack of direct evidence, most scientists believe that a massive star at the end of its life can implode to form an object so dense that nothing-not even light-can escape.

Description : How do black holes form? -Space

Last Answer : 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.

Description : What powerful force allows black holes to absorb light? -Space

Last Answer : Actually, the torrent of ultraviolet radiation is being emitted by gas that is heated as it is pulled into the black hole's powerful gravity. Black holes, by definition, are regions from which light cannot escape. Thus, any radiation observed from outside must come from outside black holes.

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Last Answer : Thankfully, though, we don’t need to worry. There are no black holes close enough to Earth to affect us. The closest black hole to Earth that we know of is named V616 Monocerotis. It is ... in your lifetime. V616 Monocerotis is about 3,300 light years away. That’s very, very far away.

Description : How can we learn about black holes if they trap light, and can't actually be seen? -Space

Last Answer : The immense gravity of black holes also distorts space itself, so it is possible to see the influence of an invisible gravitational pull on stars and other objects

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Last Answer : answer:

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Last Answer : answer:

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Last Answer : A supermassive black hole with a mass of 1011 (100 billion) M ☉ will evaporate in around 2 10100 years. Some monster black holes in the universe are predicted to continue to grow up to ... the collapse of superclusters of galaxies. Even these would evaporate over a timescale of up to 10106 years.

Description : The Event Horizon Telescope captured the now-iconic image of the M87 black hole. Why is it called that? -Space

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Description : Does time works inside black hole? -Space

Last Answer : 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 ... . No force in the universe can stop this fall, any more than we can stop the flow of time.

Description : How is the black hole study useful to us and is it in anyway relevant to the gravitational waves? -Space

Last Answer : guess it is true that there is unlikely to be any event in the near future endangering human life that involves Black Holes. However, if that were the criteria upon which we based what we should ... people have a better standard of living and I believe has already been used to rescue lost people.

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Last Answer : There are two things that affect the escape velocity - the mass of object and the distance to the center of that object. For example, a rocket must accelerate to 11.2 km/s in order to escape Earth's gravity ... the mass of our sun would need to be squeezed into a volume with a radius of about 3 km.

Description : How close did Interstellar get to the depiction of a black hole? -Space

Last Answer : At the heart of every galaxy lies a supermassive black hole, where gravity is so strong that nothing — not even light — can escape its boundary. In the movie "Interstellar," a fictional black hole called Gargantua takes center stage. The film came out exactly five years ago, in November 2014

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Last Answer : The existence of this black hole was first guessed at because the Messier87 galaxy when imaged at radio frequencies shows the signature twin-jets of plasma that are squirted out at near-relativistic ... matter, if one has telescopes with sharp enough vision, which the Event Horizon Telescope had.

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Description : Which of these radiations is used to study the black hole? -Space

Last Answer : When our eyes look at the heavens we see the visible light from stars and other objects in the Universe. Thousands of years ago astronomers in Greece and other ancient cultures already built a detailed ... . We encounter radio waves often in our daily lives, for example in radios and cell phones.

Description : Who discovered the first strong candidate for a black hole? -Space

Last Answer : Albert Einstein

Description : What pulls objects into a black hole? -Space

Last Answer : Black holes don't suck. Suction is caused by pulling something into a vacuum, which the massive black hole definitely is not. Instead, objects fall into them just as they fall toward anything that exerts gravity, like the Earth

Description : Which of these is not related to the science of black hole? -Space

Last Answer : 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.

Description : Is a black hole really a hole? -Space

Last Answer : 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.

Description : How big can a black hole be? -Space

Last Answer : A supermassive black hole (SMBH) is the largest type of black hole, on the order of hundreds of thousands to billions of solar masses ( M ☉), and is theorized to exist in the center of almost all massive galaxies.