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If you observe an object in an elliptical orbit around something, AND you know the mass of the orbiting object AND the size of the orbit, you can calculate the mass of the object at the center (more precisely, at one of the foci) of the orbit.
We observe several stars orbiting the super-massive black hole at our galactic center. We can calculate their mass based on the light they give off, and we can measure their orbits over time. From this, we can calculate the mass of that black hole.
What else can I help you with?
Where is the galatic center and its black hole?
The galactic centre is the central region of a galaxy. Most, if not all galaxies have a supermassive black hole at their centre.
What is a young galaxy with a giant black hole in the center called?
quasar
Why do astronomers hypothesize that there is a supermassive black hole at the center of the milky way?
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.
What is a very energetic distant object that may be powered by a black hole?
A quasar is a very energetic distant object that is powered by a supermassive black hole at its center. The intense radiation emitted from the accretion disk around the black hole can outshine the entire galaxy in which the quasar is located.
What is a sellar black hole?
Perhaps you mean stellar black hole. Stellar means related to a star, so that refers to a black hole that results from the collapse of a star. Actually that's the ONLY confirmed way to create a black hole (other ways are a bit hypothetical), but the term is also used to refer to a black hole which has approximately the mass of a star - to distinguish it from the supermassive galactic black holes in the center of most galaxies, as well as the intermediate-mass black holes found in star clusters.
Where is the galactic center in the constellation of Sagittarius?
The black hole Sag A* is considered to be at the center of our galaxy.
Where is the galatic center and its black hole?
The galactic centre is the central region of a galaxy. Most, if not all galaxies have a supermassive black hole at their centre.
If the sun goes to the center of the milky way in 2012 because of the galactic alignment will it be consumed by a black hole?
Let's take these fears slowly, one at a time.First, what is a "galactic alignment" ? ? ?
What object is believed to reside at the center of Active Galactic Nuclei?
The center of many galaxies is suspected to house a "supermassive black hole". The black hole may even weigh more than all the stars in that galaxy combined. Spiral galaxies are more likely to contain a supermassive black hole.
What is a young galaxy with a giant black hole in the center called?
quasar
What is the best evidence for a supermassive black hole in the center of the Milky Way galaxy?
The best evidence for a supermassive black hole in the center of the Milky Way galaxy comes from observations of the orbits of stars near the galactic center. These stars move at high speeds around an invisible object with a mass millions of times that of the Sun, indicating the presence of a supermassive black hole.
What is located in the middle of Milky Way?
The galactic center of the Milky Way is a compact object of very large mass (named Sagittarius A), strongly suspected to be a supermassive black hole.
Why is there is a black hole in the center of the galaxy?
Gravity. However, it isn't yet entirely clear how galactic black holes could grow to their current size in a relatively short time.
What has the author Tal Alexander written?
Tal Alexander has written: 'Stellar processes near the massive black hole in the galactic center' -- subject(s): Black holes (Astronomy)
What gets bigger when more is taken away?
a wormhole or black hole, the more matter it consumes or removes from its surroundings, the more its instability or mass increases, therefore its absorption power. Scientific studies say, and it is proven that, the Milky Way has a supermassive black hole in the center galactic, named Sagittarius A*. Many, if not all galaxies are believed to harbor a supermassive black hole at their center.
What is supermassive blackhole?
A supermassive black hole is a huge black hole, usually in the center of a galaxy. All or most galaxies are expected to have such supermassive black holes. Such a galactic black hole typically has over a million times the mass of our Sun; the largest (in large galaxies) have billions of times the mass of our Sun. The black hole in the center of our own galaxy (the Milky Way) is associated with the object Sagittarius A*, and it has a mass estimated at 4 million solar masses.
What is at the center of the black hole?
A singularity is at the centre of a black hole.
