Astrophysics

Dead stars are not necessarily black holes. Dead stars can become white dwarfs, neutron stars, or black holes depending on their mass. Only the most massive dead stars can collapse further to become black holes if they exceed the Chandrasekhar limit, around 1.4 times the mass of the Sun.

There is no "average" mass for black holes throughout the entire universe. Black holes range greatly in mass, depending on how they were formed, and how long they have existed if you take Hawking Radiation into account. Mass can be anywhere between a couple hundred protons, such as those created by cosmic rays striking Earth's atmosphere, or an enormous mass such as those in the center of almost every spiral galaxy.

Since most, if not all, galaxies are believed to have a central supermassive black hole, it could be said that black holes provide the gravitational underpinnings for the large scale structures of matter in the universe. Because they power quasars, the brightest and most distant objects known, they also give information to understand the scale and age of the visible universe. They continue to be of great scientific interest for several other reasons, one of which is that they illustrate the incompleteness of our physical models - since we don't have a system which adequately describes conditions and laws at the black hole singularity, where our current laws of physics appear to break down.

If you were to think that the big bang was generated by the explosion/implosion of a massive black hole then you could affirm that there were no last black holes because none have actually died yet, or you probably wouldn't be here (in your form, it may be that life has regenerated after it's distruction in another way).

So no black holes have actually died from the last big bang.

Gamma rays from a supernova can travel vast distances, potentially out to light-years away from the source. They can be detected by astronomers on Earth using specialized instruments, giving us valuable insights into the explosion and its aftermath.

The scene where the song "Supermassive Black Hole" by Muse is played in the movie "Twilight" is during the baseball scene, where the Cullen family and Bella play baseball. The song plays as they are playing the game, showcasing their speed and intensity.

Time and space are interconnected in what is known as spacetime. According to Einstein's theory of relativity, the measurements of time and space can vary depending on the relative motion between observers. This means that time and space are not separate entities but are deeply intertwined in a unified fabric of spacetime.

A magnetohydrodynamic drive is a propulsion system that uses magnetic fields to ionize and accelerate a propellant, such as seawater or plasma, to generate thrust. This technology eliminates the need for moving parts like propellers or turbines, making it potentially more efficient and reliable than traditional propulsion systems. Magnetohydrodynamic drives have potential applications in marine vessels, spacecraft, and other types of vehicles.

Accretion disks generally are energetic because of gravitational compression of infalling matter, and frictional forces which heat the matter in the accretion disk. The frequency depends on the mass of the central body. Protostellar accretion disks emit in the infrared, the higher speed and friction associated with the more intense gravity of neutron stars and black holes cause them to radiate in the higher x-ray frequencies of the electromagnetic spectrum.

The gravity in a black hole is so strong that not even light can escape. For all intents and purposes it can be considered infinite.

ITS THE DOLPHIN FROM THE YANGTZEY RIVER (CHINA) 'BAIJI'........& APART FROM MARINE LIFE THE RAREST LAND MAMMAL IS "VANCOUVER ISLAND MARMOT" & "SALT WATER BUFFALO" & "INDIAN BLACK LEOPARD"

Unfortunately black holes don't evaporate- they are a massive vacuum with a tremendous amount of gravitational force which can theoretically disassemble matter which then travels through the hole, and is reassembled (not necessarily in it's original form) at the other end of a black hole commonly called a white hole.

Earth is the only planet in our solar system known to have abundant oxygen in its atmosphere, making it suitable for sustaining life as we know it. Other planets such as Mars and Venus have trace amounts of oxygen but not enough to support human life without additional life support systems.

No, Pluto has not been sucked up by a black hole. Pluto is a dwarf planet located in our solar system, while black holes are distant cosmic phenomena with intense gravitational pull. Pluto orbits the Sun and is not at risk of being sucked up by a black hole.

Gravity is the force responsible for accretion, which is the process by which matter accumulates to form larger celestial bodies, such as stars and planets. The gravitational attraction between particles causes them to come together and coalesce into a more massive object.

If Earth were to suddenly be swallowed by a black hole, the process would be quite rapid and catastrophic without any advance warning. However, it is currently considered highly unlikely that Earth could be consumed by a black hole due to the vast distances between our planet and any known black holes.

White holes are theoretical regions of spacetime that expel matter and energy outward, the opposite of black holes which pull matter in. They do not suck up objects like black holes do. However, there is no observational evidence for the existence of white holes in the universe.

If you think about it, it makes sense. Stars with more mass will be hotter in the center, because the center will be under more pressure. A hotter center means that nuclear reactions will proceed more quickly, and thus produce more radiation. This radiation eventually works its way to the surface of the star, so the surface of a more-massive star will be hotter. Hotter surfaces radiate more energy, and thus appear brighter.

Of course, there are other variables, such as chemical composition, involved, so the mass-luminosity relation is only approximate. And other physical considerations make some stars variable, sometimes over a large range in luminosity.

There are also special cases, such as white dwarfs, for which there is an entirely different relationship between mass and luminosity than that which holds for "normal" stars.

Well first of all white holes aren't proven to exist yet so nobody knows if they pose a threat at all. Unlike black holes, white holes repel everything and spit stuff back into space, so they wouldn't really pose a threat unless they spat out a large amount of mass right at the earth.

No, the Quran does not specifically mention black holes as the concept of black holes was not known at the time when the Quran was revealed. The Quran primarily focuses on spirituality, ethics, and guidance for humanity.

The cosmic distance ladder is a series of methods that astronomers use to measure distances to objects in space, such as stars, galaxies, and other celestial bodies. It relies on combining various distance measurement techniques, such as parallax, standard candles, and redshift, to determine distances at different scales in the universe. This ladder helps us understand the vastness and structure of the cosmos.

Black holes are black holes - they are totally different from anything else in the universe. Most black holes are formed from the collapsed cores of dead stars. There are supermassive black holes in most galaxies, but it is no known how they formed.

No, it is not possible for an astronaut to be sucked into a black hole. Black holes are extremely far away and astronauts do not travel close enough to them. Additionally, the gravitational pull of a black hole is so strong that no known force or technology could overcome it.

Saturn is often associated with old age in astrology. It represents responsibility, discipline, and the passage of time. Its influence is said to bring maturity, wisdom, and lessons learned through experience.

A black hole is a region in space where the gravitational pull is so strong that nothing, not even light, can escape from it. Black holes are believed to exist in various locations throughout the universe, often found at the center of galaxies or created from the remnants of massive stars.