There is actually quite strong evidence for such a black hole - both from x-ray observations, and by observing the movement of nearby stars. The movements of nearby stars indicate that they are orbiting an object with about 4 million solar masses, and since this mass is concentrated in a very small space (the apoapsis of some of those stars is fairly close to the object), the only reasonable explanation, according to current astronomical knowledge, is a black hole.
Astronomers hypothesize the presence of a supermassive black hole at the center of the Milky Way because of the high velocities exhibited by stars orbiting the region and the intense radiation emitted, which is characteristic of black hole activity. Additionally, observations of other galaxies suggest that supermassive black holes are common in galactic centers.
Astronomers hypothesize that a massive black hole lies at the center of M87 because of the high speeds of stars orbiting the center, which indicate a very massive object. Observations also show a jet of energetic particles emanating from the center, which is commonly associated with supermassive black holes. Additionally, the size of the dark central region in M87 matches what is expected for a black hole event horizon.
They spotted a bunch of stars orbiting around in the center at crazy speeds around what appears to be nothing but the only thing that could have that much mass to swing those stars around like moons would have to be insanely dense which could only be justified by being a super massive black hole
Astronomers hypothesize that there's a supermassive black hole at the center of our galaxy, the Milky Way, both because of physical theory about the formation of galaxies, and direct observation from our own and other galaxies. Recent observations, focused on the behavior of stars very close to the nucleus of the Milky Way, led to a somewhat compelling conclusion: various stars at the galactic core could be tracked orbiting an object which was itself not directly observable (consistent with a black hole). The simple fact they were in orbit indicated the presence of a massive object. The maximum radius of the object they were orbiting had to be inside the closest approach of the nearest star in orbit, hence placing an upper limit on the radius of the object. The orbital radius and orbital period of the stars provided limits for the measurement of the amount of mass present in the object they orbited. Since the lower limit of the mass had to fit inside the maximum radius that the stars didn't collide with, the only object fitting the observations would be a supermassive black hole, of a little over four million solar masses.
Our galaxy does not contain "a" black hole, it contains thousands, perhaps millions, of them.Astronomers believe there is a supermassive black hole near the center of the galaxy, with a mass of about 4 million solar masses. They reached this conclusion, among other things, by observing objects moving around it. This makes it possible to make an estimate of the mass. Some of the objects are quite near the ... object, whatever it is, and astronomers know of nothing except a black hole that can have such a large mass in such a small space.
Astronomers hypothesize the presence of a supermassive black hole at the center of the Milky Way because of the high velocities exhibited by stars orbiting the region and the intense radiation emitted, which is characteristic of black hole activity. Additionally, observations of other galaxies suggest that supermassive black holes are common in galactic centers.
Astronomers hypothesize that a massive black hole lies at the center of M87 because of the high speeds of stars orbiting the center, which indicate a very massive object. Observations also show a jet of energetic particles emanating from the center, which is commonly associated with supermassive black holes. Additionally, the size of the dark central region in M87 matches what is expected for a black hole event horizon.
Astronomers believe a supermassive black hole lies at the center of the Milky Way galaxy because of the high speeds of stars and gas near the center, as well as the intense radiation emitted from that region. These observations suggest the presence of a massive object that can only be explained by a supermassive black hole.
The very center is believed to contain a very powerful black hole.
A blazar is an elliptical galaxy with a supermassive black hole at the center.
They spotted a bunch of stars orbiting around in the center at crazy speeds around what appears to be nothing but the only thing that could have that much mass to swing those stars around like moons would have to be insanely dense which could only be justified by being a super massive black hole
A Supermassive black hole .
Astronomers have detected a quasar in a distant galaxy.
At the center of every galaxy is a supermassive black hole.
At the center of every galaxy is a supermassive black hole.
The supermassive blackholes at the center of galaxies.
It seems that just about EVERY galaxy has a huge ("supermassive") black hole in its center.