Oh honey, those centers are shining brighter than a disco ball at Studio 54 because of supermassive black holes chowing down on anything and everything in their path. These greedy giants gobble up gas and dust, heating it up - reaching temperatures hotter than your latest ex's attitude. So, buckle up and enjoy the spectacle or get out of the way!
Galaxies with very bright centers and very little dust or gas are called elliptical galaxies. These galaxies are primarily made up of old stars and have a smooth, ellipsoidal shape with little ongoing star formation.
A very bright object that generates far more energy than a typical star is a quasar. Quasars are supermassive black holes at the centers of distant galaxies, surrounded by accreting material that emits enormous amounts of energy, often outshining entire galaxies. This energy is produced as matter falls into the black hole, heating up and emitting radiation across the electromagnetic spectrum. Their extreme luminosity makes them some of the brightest objects in the universe.
Galaxies may have any of four general shapes. Elliptical galaxies show little or no structure and vary in general shape from moderately flat and round or oval to spherical. Spiral galaxies have a small, bright central region, or nucleus, and arms that come out of the nucleus and wind around, trailing off like a giant pinwheel. In barred spiral galaxies, the arms extend sideways in a short straight line before turning off into the spiral shape. Both kinds of spiral systems are flat. Irregular galaxies are usually rather small and do not have a symmetrical shape.
Some of the most intense sources of light in the universe are quasars, which are extremely bright and energetic regions around supermassive black holes at the centers of galaxies, and gamma-ray bursts, which are short bursts of high-energy gamma rays released during cataclysmic events like supernovae or neutron star mergers.
because the moon shines so bright
Galaxies with very bright centers and very little dust or gas are called elliptical galaxies. These galaxies are primarily made up of old stars and have a smooth, ellipsoidal shape with little ongoing star formation.
No. They have a spiral shape.,
Elliptical galaxies are generally old but not very bright
Not all galaxies have black holes in their centers, but many large galaxies, including our own Milky Way, are believed to have supermassive black holes at their centers.
There have been some suggestions that the objects called quasars might be extremely active galaxies with unusually supermassive black holes at their centers at such great distance from us that it is not possible for telescopes to resolve their galactic structure, making them just look like very bright stars (quasi-stellar objects). However this has not been verified.If these suggestions are correct, these extremely active galaxies must be so distant that the light we are seeing from them must have been emitted only a short time after the big bang began, in the initial cycle of star formation, which would make them the earliest galaxies formed and likely very young galaxies. However if they are this young these extremely active galaxies might have galactic structures so different from the galaxies we are familiar with that even if our telescopes could resolve them, we might not recognize them as galaxies.
Yes, many galaxies have supermassive black holes at their centers.
Both have a huge black hole at their center.
The brightness of normal galaxies is mainly due to stars; quasars are believed to get most of their energy output from the black hole at their center.
Spiral Galaxies
Yes. Some background galaxies are invisible due to being close to a bright foreground galaxy.
Virtually all the ones we know anything about probably formed as the result of the death of a very large star, or at the centers of galaxies. Most if not all galaxies have super massive black holes at their centers.
Yes. Some faint background galaxies are masked out due to being close to a bright foreground galaxy.