Why can black holes glow?

The fact that some concentrated black holes exceed even the stars around them, can be seen clearly in the Hubble telescopes.

The cause of black holes glowing

A black hole is an area in space-time that a gravitational field prevents everything, including light, from escaping. It is described as "black" because it has the ability to absorb all radiation and material absorbed through the event horizon, like an absolute black object in thermodynamics; it is also not a kind of "hole" or "hole" but an area of ​​spacetime that does not let anything escape.

The fact that some concentrated black holes are even more than all the stars around them , this can be seen clearly in the Hubble telescope images, so why one " "Can the light escape so bright? Let's find out with us.

Photos of the black hole in August 2011 through NASA's Hubble telescope.

When matter shrinks into such a small space that it basically becomes a point, the "official" black hole takes place. The event horizon of a black hole is the point at which anything that falls into cannot escape. Even if the light was captured and slipped into the heart of the black hole, the whole universe became dark in that space.

Many scientists deduce the existence of black holes by examining the gravitational attraction of nearby stars, but they cannot find the movement of every star everywhere. In some cases, the best way to find a black hole is to look for areas of bright light. Indeed, when scientists see an extremely bright spot in a relatively small space, one of their first thoughts is that they are looking at a black hole.

The black hole can create the brightest object in the universe - quasar.

The matter that falls into the black hole forms on the accretion area , where matter collides and rubs together, becoming a plasma state emitting intense radiation; making the environment around the black hole become one of the brightest objects in the universe. And because so much material can spin around a black hole, there is a lot of fuel to keep it shining. Even so, black holes don't shine forever . They will eventually darken, and then they will grow. But why does the black hole itself emit light, not just around it?

The phenomenon of light emitted from the black hole has been shown to be the inverse case of the Compton effect , a study by physicist Arthur Compton that helped him to win the 1927 Nobel Prize in physics. photons are very abundant in the universe and their energy is much lower than the visible spectrum but if photons are near the black hole they will collide with matter particles (eg electrons) present. at the accretion area of ​​the black hole. Then, the energy of the electron will travel through the photon and push their energy level to the visible spectrum.