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.
Timing is everything as astronomers are making discovers all the time. As of an article posted in March of 2012 - Galaxy J1120+0641, containing the most distant supermassive black hole known to science, is so far away that light from it takes over 13 billion years to reach our planet. This means the light astronomers see from this galaxy is just 740 million years after the Big Bang.
One theory suggests that a black hole (a collapsed star with immense density) is located in the center of the galaxy. Another theory suggests that there's a wormhole leading to a whole other universe or dimension.
The supermassive black hole that hosts the galaxy NGC 1277, in the constellation Perseus, is currently the largest black hole in our visible universe with a mass equivalent to 17 billion suns. In 2012, astronomers have discovered this small galaxy about 250 million light-years from Earth.
Yes. All galaxy objects revolve around the centre of mass, which we believe is a massive black hole.
No. We are at a safe distance from the galaxy's central black hole and there is no reason to believe that will change.
Astronomers believe that black holes exist in the center of every universe. They even think that there may be a black hole in the center of our galaxy, the Milky Way
A black hole or a worm hole :) good luck
Currently, most astronomers believe there is probably a large black hole at the center of most, if not all, galaxies, including ours. There are also probably many smaller black holes scattered throughout.
Yes
I don't think there is a galaxy called "Satan A"; at least, not as a standard name, generally accepted by astronomers. On the other hand, most larger galaxies have a supermassive black hole at its center, and it can be expected that any galaxy has several stellar black holes.
Timing is everything as astronomers are making discovers all the time. As of an article posted in March of 2012 - Galaxy J1120+0641, containing the most distant supermassive black hole known to science, is so far away that light from it takes over 13 billion years to reach our planet. This means the light astronomers see from this galaxy is just 740 million years after the Big Bang.
The speed of rotation of a galaxy is related to the mass of the galaxy. Most galaxies appear to be spinning more quickly than their masses could account for, leading some scientists to believe that (many? most?) galaxies are heavier than they appear to be. So if there is a lot of extra mass that we cannot see, a black hole is a logical supposition. We can't prove it - yet - but many astronomers believe that supermassive black holes may reside in the centers of most galaxies.
One theory suggests that a black hole (a collapsed star with immense density) is located in the center of the galaxy. Another theory suggests that there's a wormhole leading to a whole other universe or dimension.
The supermassive black hole that hosts the galaxy NGC 1277, in the constellation Perseus, is currently the largest black hole in our visible universe with a mass equivalent to 17 billion suns. In 2012, astronomers have discovered this small galaxy about 250 million light-years from Earth.
Yes. In fact, it seems that most galaxies have a gigantic black hole (with a mass of millions, or even billions, of times the mass of our Sun) in their center.
Yes, probably many of them. We believe that there is a supermassive black hole at the center of the Milky Way galaxy; that there are probably similar suoermassive black holes at the centers of many large galaxies.
specifically, "astronomers" that study black holes are called cosmologists.