Our very own Milky Way galaxy harbors a black hole boasting about four million solar masses - which qualifies it as supermassive and quite large. Our nearby ('close' in astronomical standards...) sister galaxy Andromeda might have one fifty times larger!
26,000 light years.
Any star that gets too close to a black hole can be drawn into it. But most stars can orbit the center of the galaxy almost indefinitely, without such a thing happening.
very rapid motion of matter close to the nucleus of the galaxy, requiring a very massive body to hold it in orbit
Wavelengths is what allows astronomers redshift a background galaxy that is covered up. This is due to being close to the foreground galaxy.
To save space, harbors are small.
Here are some galaxies (all of them part of the Local Group): The Milky Way, our own galaxy The Andromeda Galaxy, another large galaxy The Triangulum Galaxy, another large galaxy The Large Magellanic Cloud, a dwarf galaxy close to the Milky Way The Small Magellanic Cloud, another dwarf galaxy close to the Milky Way
Le Havre on the English channel, Rouen on the Seine river, are the closest ports to Paris.
Black holes could be dangerous to people if people were close to a black hole, but there are no black holes near the planet Earth (as far as we know) and the closest one is probably in the center of the Milky Way galaxy, which is about 80,000 light years from Earth, which is a safe distance.
There are no known black holes near Saturn. The nearest known black holes are much further away in our galaxy. Saturn does have its own moons and rings, but black holes are not typically found in such close proximity to planets.
spril
Five minutes away!
Yes. Some background galaxies are invisible due to being close to a bright foreground galaxy.