Rewrite the article. Emphasize the importance of using Hubble for finding black holes.

Astronomers using NASA's Hubble Space Telescope have come up with what they say is some of their best evidence yet for the presence of a rare class of "intermediate-sized" black hole that may be lurking in the heart of the closest globular star cluster to Earth, located 6,000 light-years away.

Like intense gravitational potholes in the fabric of space, virtually all black holes seem to come in two sizes: small and humongous. It's estimated that our galaxy is littered with 100 million small black holes (several times the mass of our Sun) created from exploded stars. The universe at large is flooded with supermassive black holes, weighing millions or billions of times our Sun’s mass and found in the centers of galaxies.

A long-sought missing link is an intermediate-mass black hole, weighing in somewhere between 100 and 100,000 solar masses. How would they form, where would they hang out, and why do they seem to be so rare?

Astronomers have identified other possible intermediate-mass black holes through a variety of observational techniques. Two of the best candidates — 3XMM J215022.4−055108, which Hubble helped discover in 2020, and HLX-1, identified in 2009 — reside in dense star clusters in the outskirts of other galaxies. Each of these possible black holes has the mass of tens of thousands of suns, and may have once been at the centers of dwarf galaxies. NASA’s Chandra X-ray observatory has also helped make many possible intermediate black hole discoveries, including a large sample in 2018.

Looking much closer to home, there have been a number of suspected intermediate-mass black holes detected in dense globular star clusters orbiting our Milky Way galaxy. For example, in 2008, Hubble astronomers announced the suspected presence of an intermediate-mass black hole in the globular cluster Omega Centauri. For a number of reasons, including the need for more data, these and other intermediate-mass black hole findings still remain inconclusive and do not rule out alternative theories.

Hubble's unique capabilities have now been used to zero in on the core of the globular star cluster Messier 4 (M4) to go black-hole hunting with higher precision than in previous searches. "You can't do this kind of science without Hubble," said Eduardo Vitral of the Space Telescope Science Institute in Baltimore, Maryland, lead author on a paper to be published in the Monthly Notices of the Royal Astronomical Society.

Vitral’s team has detected a possible intermediate-mass black hole of roughly 800 solar masses. The suspected object can't be seen, but its mass is calculated by studying the motion of stars caught in its gravitational field, like bees swarming around a hive. Measuring their motion takes time, and a lot of precision. This is where Hubble accomplishes what no other present-day telescope can do. Astronomers looked at 12 years' worth of M4 observations from Hubble and resolved pinpoint stars.

His team estimates that the black hole in M4 could be as much as 800 times our Sun's mass. Hubble's data tend to rule out alternative theories for this object, such as a compact central cluster of unresolved stellar remnants like neutron stars, or smaller black holes swirling around each other.

"We have good confidence that we have a very tiny region with a lot of concentrated mass. It's about three times smaller than the densest dark mass that we had found before in other globular clusters," said Vitral. "The region is more compact than what we can reproduce with numerical simulations when we take into account a collection of black holes, neutron stars, and white dwarfs segregated at the cluster's center. They are not able to form such a compact concentration of mass."

A grouping of close-knit objects would be dynamically unstable. If the object isn't a single intermediate-mass black hole, it would require an estimated 40 smaller black holes crammed into a space only one-tenth of a light-year across to produce the observed stellar motions. The consequences are that they would merge and/or be ejected in a game of interstellar pinball.

"We measure the motions of stars and their positions, and we apply physical models that try to reproduce these motions. We end up with a measurement of a dark mass extension in the cluster's center," said Vitral. "The closer to the central mass, more randomly the stars are moving. And, the greater the central mass, the faster these stellar velocities."

Because intermediate-mass black holes in globular clusters have been so elusive, Vitral cautions, "While we cannot completely affirm that it is a central point of gravity, we can show that it is very small. It's too tiny for us to be able to explain other than it being a single black hole. Alternatively, there might be a stellar mechanism we simply don't know about, at least within current physics."
system
Rewrite the article. Emphasize the importance of using Hubble for finding black holes.

Astronomers using NASA's Hubble Space Telescope have come up with what they say is some of their best evidence yet for the presence of a rare class of "intermediate-sized" black hole that may be lurking in the heart of the closest globular star cluster to Earth, located 6,000 light-years away.

Like intense gravitational potholes in the fabric of space, virtually all black holes seem to come in two sizes: small and humongous. It's estimated that our galaxy is littered with 100 million small black holes (several times the mass of our Sun) created from exploded stars. The universe at large is flooded with supermassive black holes, weighing millions or billions of times our Sun’s mass and found in the centers of galaxies.

A long-sought missing link is an intermediate-mass black hole, weighing in somewhere between 100 and 100,000 solar masses. How would they form, where would they hang out, and why do they seem to be so rare?

Astronomers have identified other possible intermediate-mass black holes through a variety of observational techniques. Two of the best candidates — 3XMM J215022.4−055108, which Hubble helped discover in 2020, and HLX-1, identified in 2009 — reside in dense star clusters in the outskirts of other galaxies. Each of these possible black holes has the mass of tens of thousands of suns, and may have once been at the centers of dwarf galaxies. NASA’s Chandra X-ray observatory has also helped make many possible intermediate black hole discoveries, including a large sample in 2018.

Looking much closer to home, there have been a number of suspected intermediate-mass black holes detected in dense globular star clusters orbiting our Milky Way galaxy. For example, in 2008, Hubble astronomers announced the suspected presence of an intermediate-mass black hole in the globular cluster Omega Centauri. For a number of reasons, including the need for more data, these and other intermediate-mass black hole findings still remain inconclusive and do not rule out alternative theories.

Hubble's unique capabilities have now been used to zero in on the core of the globular star cluster Messier 4 (M4) to go black-hole hunting with higher precision than in previous searches. "You can't do this kind of science without Hubble," said Eduardo Vitral of the Space Telescope Science Institute in Baltimore, Maryland, lead author on a paper to be published in the Monthly Notices of the Royal Astronomical Society.

Vitral’s team has detected a possible intermediate-mass black hole of roughly 800 solar masses. The suspected object can't be seen, but its mass is calculated by studying the motion of stars caught in its gravitational field, like bees swarming around a hive. Measuring their motion takes time, and a lot of precision. This is where Hubble accomplishes what no other present-day telescope can do. Astronomers looked at 12 years' worth of M4 observations from Hubble and resolved pinpoint stars.

His team estimates that the black hole in M4 could be as much as 800 times our Sun's mass. Hubble's data tend to rule out alternative theories for this object, such as a compact central cluster of unresolved stellar remnants like neutron stars, or smaller black holes swirling around each other.

"We have good confidence that we have a very tiny region with a lot of concentrated mass. It's about three times smaller than the densest dark mass that we had found before in other globular clusters," said Vitral. "The region is more compact than what we can reproduce with numerical simulations when we take into account a collection of black holes, neutron stars, and white dwarfs segregated at the cluster's center. They are not able to form such a compact concentration of mass."

A grouping of close-knit objects would be dynamically unstable. If the object isn't a single intermediate-mass black hole, it would require an estimated 40 smaller black holes crammed into a space only one-tenth of a light-year across to produce the observed stellar motions. The consequences are that they would merge and/or be ejected in a game of interstellar pinball.

"We measure the motions of stars and their positions, and we apply physical models that try to reproduce these motions. We end up with a measurement of a dark mass extension in the cluster's center," said Vitral. "The closer to the central mass, more randomly the stars are moving. And, the greater the central mass, the faster these stellar velocities."

Because intermediate-mass black holes in globular clusters have been so elusive, Vitral cautions, "While we cannot completely affirm that it is a central point of gravity, we can show that it is very small. It's too tiny for us to be able to explain other than it being a single black hole. Alternatively, there might be a stellar mechanism we simply don't know about, at least within current physics."
user
Astronomers have been using the Hubble Space Telescope to find intermediate-sized black holes in a globular star cluster 6,000 light-years from Earth. These elusive black holes are about 100 to 100,000 times the mass of the Sun.
Intermediate black holes often form the center of dwarf galaxies. Data from other telescopes such as the Chandra X-Ray Telescope generated several candidates for intermediate black holes in dense star clusters at the edge of other galaxies. Other intermediate black hole candidates exist at the edge of our Milky Way. These black hole candidates show signs of having masses that are tens of thousands of times the mass of our Sun. One black hole candidate was discovered in the Omega Centauri globular cluster in 2008. However, astronomers need more data to confirm that they are intermediate black holes or formulate an alternative explanation for the candidates.
Astronomers can use Hubble Space Telescope's capabilities to search for intermediate black holes in the globular star cluster, known as Messier 4. Astronomers such as Eduardo Vitral of the Space Telescope Science Institute praised the precision with which the Hubble Space Telescope can make the required obervations.
"You can't do this kind of science without Hubble," Vitral said.
Eduardo Vitral's research team already discovered an intermediate black hole that is 800 times the mass of the Sun. They plan to publish their findings in a paper that will be published in the Monthly Notices of the Royal Astronomical Society.
It is impossible to directly view a black hole. However, the Hubble Space Telescope can observe the motion of objects that may be moving close to a black hole. The research team used 12 years' worth of Messier 4 observations to discover the intermediate black hole. 
The researchers' modeling of the data produced by the Hubble Space Telescope ruled out alternative theories for the behavior of these objects, such as multiple smaller black holes orbiting one another, neutron stars, or white dwarfs. A theoretical collection of small black holes would have been packed too closely together to avoid merging with other black holes or being punted out of the cluster by gravitational interactions, for instance.
Vitral acknowledged that intermediate black holes are elusive. Most known black holes are either small -- "only" several times the mass of our Sun -- or huge black holes like the one at the center of the Milky Way Galaxy. Astronomers also estimate that there are as many as 100 million small black holes in the Milky Way Galaxy. These small black holes often form from large stars that exploded. Large black holes typically have masses of millions or billions of times the mass of the Sun.
However, with our current understanding of physics and data from the Hubble Space Telescope, an intermediate black hole is the most likely explanation for the object discovered by Eduardo Vitral's research team.
assistant
<|system|>
</s>
<|user|>
Rewrite the article. Emphasize the importance of using Hubble for finding black holes.

Astronomers using NASA's Hubble Space Telescope have come up with what they say is some of their best evidence yet for the presence of a rare class of "intermediate-sized" black hole that may be lurking in the heart of the closest globular star cluster to Earth, located 6,000 light-years away.

Like intense gravitational potholes in the fabric of space, virtually all black holes seem to come in two sizes: small and humongous. It's estimated that our galaxy is littered with 100 million small black holes (several times the mass of our Sun) created from exploded stars. The universe at large is flooded with supermassive black holes, weighing millions or billions of times our Sun’s mass and found in the centers of galaxies.

A long-sought missing link is an intermediate-mass black hole, weighing in somewhere between 100 and 100,000 solar masses. How would they form, where would they hang out, and why do they seem to be so rare?

Astronomers have identified other possible intermediate-mass black holes through a variety of observational techniques. Two of the best candidates — 3XMM J215022.4−055108, which Hubble helped discover in 2020, and HLX-1, identified in 2009 — reside in dense star clusters in the outskirts of other galaxies. Each of these possible black holes has the mass of tens of thousands of suns, and may have once been at the centers of dwarf galaxies. NASA’s Chandra X-ray observatory has also helped make many possible intermediate black hole discoveries, including a large sample in 2018.

Looking much closer to home, there have been a number of suspected intermediate-mass black holes detected in dense globular star clusters orbiting our Milky Way galaxy. For example, in 2008, Hubble astronomers announced the suspected presence of an intermediate-mass black hole in the globular cluster Omega Centauri. For a number of reasons, including the need for more data, these and other intermediate-mass black hole findings still remain inconclusive and do not rule out alternative theories.

Hubble's unique capabilities have now been used to zero in on the core of the globular star cluster Messier 4 (M4) to go black-hole hunting with higher precision than in previous searches. "You can't do this kind of science without Hubble," said Eduardo Vitral of the Space Telescope Science Institute in Baltimore, Maryland, lead author on a paper to be published in the Monthly Notices of the Royal Astronomical Society.

Vitral’s team has detected a possible intermediate-mass black hole of roughly 800 solar masses. The suspected object can't be seen, but its mass is calculated by studying the motion of stars caught in its gravitational field, like bees swarming around a hive. Measuring their motion takes time, and a lot of precision. This is where Hubble accomplishes what no other present-day telescope can do. Astronomers looked at 12 years' worth of M4 observations from Hubble and resolved pinpoint stars.

His team estimates that the black hole in M4 could be as much as 800 times our Sun's mass. Hubble's data tend to rule out alternative theories for this object, such as a compact central cluster of unresolved stellar remnants like neutron stars, or smaller black holes swirling around each other.

"We have good confidence that we have a very tiny region with a lot of concentrated mass. It's about three times smaller than the densest dark mass that we had found before in other globular clusters," said Vitral. "The region is more compact than what we can reproduce with numerical simulations when we take into account a collection of black holes, neutron stars, and white dwarfs segregated at the cluster's center. They are not able to form such a compact concentration of mass."

A grouping of close-knit objects would be dynamically unstable. If the object isn't a single intermediate-mass black hole, it would require an estimated 40 smaller black holes crammed into a space only one-tenth of a light-year across to produce the observed stellar motions. The consequences are that they would merge and/or be ejected in a game of interstellar pinball.

"We measure the motions of stars and their positions, and we apply physical models that try to reproduce these motions. We end up with a measurement of a dark mass extension in the cluster's center," said Vitral. "The closer to the central mass, more randomly the stars are moving. And, the greater the central mass, the faster these stellar velocities."

Because intermediate-mass black holes in globular clusters have been so elusive, Vitral cautions, "While we cannot completely affirm that it is a central point of gravity, we can show that it is very small. It's too tiny for us to be able to explain other than it being a single black hole. Alternatively, there might be a stellar mechanism we simply don't know about, at least within current physics."</s>
<|assistant|>
Astronomers have been using the Hubble Space Telescope to find intermediate-sized black holes in a globular star cluster 6,000 light-years from Earth. These elusive black holes are about 100 to 100,000 times the mass of the Sun.
Intermediate black holes often form the center of dwarf galaxies. Data from other telescopes such as the Chandra X-Ray Telescope generated several candidates for intermediate black holes in dense star clusters at the edge of other galaxies. Other intermediate black hole candidates exist at the edge of our Milky Way. These black hole candidates show signs of having masses that are tens of thousands of times the mass of our Sun. One black hole candidate was discovered in the Omega Centauri globular cluster in 2008. However, astronomers need more data to confirm that they are intermediate black holes or formulate an alternative explanation for the candidates.
Astronomers can use Hubble Space Telescope's capabilities to search for intermediate black holes in the globular star cluster, known as Messier 4. Astronomers such as Eduardo Vitral of the Space Telescope Science Institute praised the precision with which the Hubble Space Telescope can make the required obervations.
"You can't do this kind of science without Hubble," Vitral said.
Eduardo Vitral's research team already discovered an intermediate black hole that is 800 times the mass of the Sun. They plan to publish their findings in a paper that will be published in the Monthly Notices of the Royal Astronomical Society.
It is impossible to directly view a black hole. However, the Hubble Space Telescope can observe the motion of objects that may be moving close to a black hole. The research team used 12 years' worth of Messier 4 observations to discover the intermediate black hole. 
The researchers' modeling of the data produced by the Hubble Space Telescope ruled out alternative theories for the behavior of these objects, such as multiple smaller black holes orbiting one another, neutron stars, or white dwarfs. A theoretical collection of small black holes would have been packed too closely together to avoid merging with other black holes or being punted out of the cluster by gravitational interactions, for instance.
Vitral acknowledged that intermediate black holes are elusive. Most known black holes are either small -- "only" several times the mass of our Sun -- or huge black holes like the one at the center of the Milky Way Galaxy. Astronomers also estimate that there are as many as 100 million small black holes in the Milky Way Galaxy. These small black holes often form from large stars that exploded. Large black holes typically have masses of millions or billions of times the mass of the Sun.
However, with our current understanding of physics and data from the Hubble Space Telescope, an intermediate black hole is the most likely explanation for the object discovered by Eduardo Vitral's research team.</s>
