Distance in the universe can be measured by the redshift, which is the increase in the wavelength of electromagnetic waves relative to the wavelength emitted. The greater the redshift of an object, the farther it is and the earlier it appears in the history of the universe. James Webb newly found Many black holes are found at redshifts between 4 and 6, which corresponds to when the universe was about 1 to 1.5 billion years old. The telescope also found the most distant black hole ever detected, with a redshift of 10.6, indicating that 400 million years after the Big Bang, black hole nuclei had already formed and were capable of forming a supermassive object.
Greedy Dark Star Eaters
A mysterious black hole is nothing more than a large amount of matter concentrated in a small region with a gravitational field so strong that nothing, not even light, can escape from it. It is formed when stars collapse in a supernova explosion, and the material released from them exceeds 2.5-3 solar masses and does not become a neutron star. It cannot be observed directly due to the lack of light, but through the change in the environment around it, we can infer whether there is a black hole nearby, as
They absorb everything and emit gamma rays.
The Milky Way may contain more than 100 million black holes. The first black hole discovered, Cygnus –X1, is in the constellation Cygnus, and the black hole closest to Earth is called the Unicorn because it is in the Unicorn constellation and has a uniquely low mass (about three times the mass of the Sun).
Stephen Hawking claimed that black holes can emit energy and slowly contract. According to quantum theory, there are virtual particles that are constantly entering and exiting black holes. When this happens, a particle and its antiparticle appear, and if this happens near the black hole’s event horizon, one of them may be pulled into the black hole by gravity, while the other may be ejected out into space. In the general theory of relativity, the event horizon is the boundary of space-time beyond which events do not affect the observer, and the light rays that start behind him do not cross the event horizon. Could the Earth be sucked into the event horizon, could we end up in a black hole?
Gaurav Khanna, a physicist at the University of Rhode Island He says:
The idea that a black hole can swallow the universe is based on the misconception that they act as a vacuum, sucking space into themselves. But this is not the case.
After all, Khanna continues, they only absorb things close to them, or more precisely, things that appear on the event horizon.
The event horizon for a solar-mass black hole is three kilometers across, Khanna says, while an Earth-mass black hole is only a few inches in diameter. But it is true that the gravity of the black hole affects the stars and planets around it, and it can affect its orbit, but it does not absorb it.
Why don’t we fall for it?
York University astronomy professor Paul Delaney also gave an example on the university’s website in the articlewhere it says
If the sun turned into a black hole, the earth would not experience a change in the gravitational force, it would continue to rotate itself, and it would just be dark and cold.
Alexey Filippenko, a black hole researcher at the University of California, Berkeley, said that the most likely way for a black hole to swallow a star or something is if it is in its immediate vicinity, and for example, the sun is swallowed by the sun. The black hole is at the center of the Milky Way, which is unlikely because the Sun’s orbit must be on the same line with the black hole.
Large black holes suck in the stars around them, emitting tons of radiation that ionizes the surrounding matter. This makes it difficult for gas and dust to cool down, fall into the black hole, and eventually slow down the black hole. This is exactly what prevents entire galaxies from disappearing into black holes.
Khanna said the expansion of the universe makes it less likely that black holes will swallow us, because as objects get farther apart in space, the chance of colliding with a black hole decreases. So, he says, it’s completely pointless to worry about being swallowed up by a dark object, unless our universe is already inside a black hole.
(Cover Photo: Universal History Archive/Global Image Collection/Getty Images )
