(ORDO NEWS) — Black holes are regions of space where gravity is so strong that even the fastest object in the universe cannot escape from it, writes Newsweek. At the same time, experts point out that black holes absorb matter poorly and are terribly inefficient.
What is the probability that the Earth will someday be sucked into a black hole? And if it does happen, then how?
Experts believe that the chance that the Earth will ever collide with a black hole before it is swallowed by the Sun – and this will happen in about five billion years – is practically zero.
“To begin with, outer space is called that for a reason,” said University of Rhode Island Physics Department professor Doug Gobielle. “The average density of luminous matter in the universe is about one proton per cubic meter. In the galaxy and the solar system, the density is significantly higher, but still virtually non-existent.
“Objects that we consider ‘large’ and ‘dense’ are quite rare in the Universe: these are planets, stars and their associated remnants – white dwarfs, neutron stars and black holes,” Gobiel explained.
Although there are countless stars in our galaxy alone, chance encounters between them are extremely rare due to the vast distance between objects, said Jonathan Zrake, associate professor of physics and astronomy at Clemson University.
“Apart from a super-advanced civilization with virtually unlimited resources and energy, which will deliberately “launch” a black hole into the solar system, such a collision is so unlikely that it is almost zero,” said Gobiel.
“We don’t usually worry about stars passing through the solar system, so this can be extrapolated to the rest of the objects in the galaxy,” he said.
“From time to time, stars come close enough to knock out a few comets from the farthest extremities of the solar system, the so-called Oort Cloud, – this affects their gravitational influence on the solar system. Surely the same will be with black holes and other compact masses that wander outside the solar system,” he said.
Should we be afraid of “nearby” black holes?
According to experts, even the closest black holes to our solar system are too far away to affect us in any way.
For example, to V616 Monocerotis, which is considered one of the closest, more than 3,000 light years away.
“Even if a black hole swallows its twin star, its mass will not be enough for anything other than a few bursts of radiation,” Gobiel emphasized. “At this distance from the Earth, we will generally notice this only with the help of powerful instruments. will be completely zero.
Black holes fall into two main types: stellar and supermassive (although recent research has shown that there is probably some intermediate class). Stellar black holes are several times as massive as our Sun. Supermassive black holes can have masses from a few million to billions of suns.
Stellar-mass black holes like V616 Mon are the remnants of massive stars that died in cataclysmic cosmic explosions—also called supernovae. The nearest star that could theoretically form a black hole is Betelgeuse, the second brightest star in the constellation of Orion.
Betelgeuse is nearing the end of its life and is likely to produce a supernova sometime in the next 10,000 years or so, according to Zreik. But it is also located about 500 light years from us, and even if it really turns into a black hole, this will not have any effect on the Earth.
How close does a black hole have to be to affect anything?
“While missing a supermassive black hole or even an intermediate-mass black hole somewhere near the solar system will be difficult, it is quite possible to miss a stellar-mass black hole on the outskirts of the solar system,” says Gobiel.
“But even a large stellar-mass black hole, say 30 solar masses, would have to be closer than Neptune (which is almost 30 times farther than the Earth to the Sun) to have any gravitational effect on the Earth, and about Jupiter’s distance (about five times as far as the Earth to the Sun) to pull the Earth with a force roughly equal to the Sun’s gravity,” he said.
Black holes are thought to be all-powerful cosmic vacuum cleaners that gobble up everything in their path, but Gobiel says that’s not the case at all.
“Generally speaking, black holes absorb matter terribly badly,” he said. “The answer to the question of why black holes have not yet swallowed the universe is that they are in most cases extremely inefficient and do not grow well.”
What if the Earth is sucked into a black hole?
If a black hole somehow gets close to the Earth (for example, closer than the orbit of the Moon) and moves slowly enough, then our planet will certainly be torn apart by incredible gravity.
“The Earth will lose its atmosphere and oceans, and molten metal will pour out of the Earth’s mantle into space,” Zreik said.
Terrestrial fragments will fall into orbit around the black hole and evaporate into an ionized gas consisting of atoms or molecules that have lost an electron or, conversely, gained an additional one. The gas forms a ring of material around the black hole, called an accretion disk, and most of it will be consumed within a few hours or days, Zreik said.
“The released energy will drive powerful streams of plasma into space – one of the four basic states of matter – and give high-energy radiation. Astronomers from nearby planets will certainly notice a burst of radiation,” he said.
But the chance that this scenario will materialize is astronomically small. Slightly more plausible, but still unlikely, is a scenario in which a black hole gets close enough to somehow affect the Earth, but not close enough to swallow our planet.
The main danger, at least for life on the planet, is the event in which a black hole perturbs the Earth’s orbit so much that the climate changes or a huge amount of debris from the solar system (asteroids, comets and satellites) moves towards us with a high risk of collision, explains Zreik.
“Life on Earth will certainly survive, but humanity and most of the multicellular species on Earth are unlikely to survive,” Gobiel concluded.
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