Definitions for supermassive black hole
su·per·mas·sive black hole

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1. supermassive black holenoun

   Any black hole with a mass 10 to a few times 10 times that of the Sun.

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1. Supermassive black hole

   A supermassive black hole (SMBH or sometimes SBH) is the largest type of black hole, with its mass being on the order of hundreds of thousands, or millions to billions of times the mass of the Sun (M☉). Black holes are a class of astronomical objects that have undergone gravitational collapse, leaving behind spheroidal regions of space from which nothing can escape, not even light. Observational evidence indicates that almost every large galaxy has a supermassive black hole at its center. For example, the Milky Way has a supermassive black hole in its Galactic Center, corresponding to the radio source Sagittarius A*. Accretion of interstellar gas onto supermassive black holes is the process responsible for powering active galactic nuclei (AGNs) and quasars.Two supermassive black holes have been directly imaged by the Event Horizon Telescope: the black hole in the giant elliptical galaxy Messier 87 and the black hole at the Milky Way’s center.

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1. Supermassive black hole

   A supermassive black hole is the largest type of black hole, on the order of hundreds of thousands to billions of solar masses. Most—and possibly all—galaxies are inferred to contain a supermassive black hole at their centers. In the case of the Milky Way, the SMBH is believed to correspond with the location of Sagittarius A*. Supermassive black holes have properties which distinguish them from lower-mass classifications. First, the average density of a supermassive black hole can be less than the density of water in the case of some supermassive black holes. This is because the Schwarzschild radius is directly proportional to mass, while density is inversely proportional to the volume. Since the volume of a spherical object is directly proportional to the cube of the radius, the density of a black hole is inversely proportional to the square of the mass, and thus higher mass black holes have lower average density. Also, the tidal forces in the vicinity of the event horizon are significantly weaker. Since the central singularity is so far away from the horizon, a hypothetical astronaut traveling towards the black hole center would not experience significant tidal force until very deep into the black hole.

How to pronounce supermassive black hole?

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Numerology

1. Chaldean Numerology

   The numerical value of supermassive black hole in Chaldean Numerology is: 6

2. Pythagorean Numerology

   The numerical value of supermassive black hole in Pythagorean Numerology is: 2

Examples of supermassive black hole in a Sentence

1. Andrea Ghez:

   What's so special about S0-2 is we have its complete orbit in three dimensions, that's what gives us the entry ticket into the tests of general relativity. We asked how gravity behaves near a supermassive black hole and whether Einstein's theory is telling us the full story. Seeing stars go through their complete orbit provides the first opportunity to test fundamental physics using the motions of these stars.

2. Erin Kara:

   Tidal disruption events offer us this rare view at the most common kind of supermassive black hole in the universe— these so-called dormant supermassive black holes, tidal disruption events, where the stellar debris causes the formation of a temporary accretion disk, offers us a way to probe this population of supermassive black holes.

3. Dr Wolf:

   These large and rapidly-growing black holes are exceedingly rare, and we have been searching for them with SkyMapper for several months now. The European Space Agency’s Gaia satellite, which measures tiny motions of celestial objects, helped us find this supermassive black hole, as supermassive black holes shine, they can be used as beacons to see and study the formation of elements in the early galaxies of the universe.

4. Dheeraj Pasham:

   The fact that we can track this region of bright X-ray emission as it circles the black hole lets us track just how quickly material in the disk is spinning, that gives us information about the spin rate of the supermassive black hole itself.

5. Chris Harrison:

   There is a supermassive black hole at the center of our Milky Way, there is now good evidence that this black hole has driven large amounts of energy into the galaxy in the past, through the so-called ‘Fermi Bubbles,’ as well as other evidence. It is likely that billions of years ago the Milky Way was forming stars much more rapidly and the black hole may have played a role in shutting this down. However, this is not well understood. It is worth pointing out that the galaxies where we believe supermassive black holes have had the most influence are ‘dead’ with little-to-no stars forming. In contrast, the Milky Way is still forming stars (around one per year).

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Supermassive_Black_Hole
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Supermassive_Black_Hole
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=supermassive black hole