It creates an infinitely curved region of space-time, from which nothing can escape, not even light. Do black holes rotate? This is an interesting but not so simple question that I received in one of my recent lectures. To answer it completely and accurately, we need a clear understanding of the very verifiable properties of black holes as well as about the nature of rotation. To date, the concept of rotating black holes is not new. In fact, every object in the universe, once having a mass large enough to be spherical, will also have a rotation. Since mass exerts gravity, every object tends to compress itself – because its parts attract each other. For small masses, this gravitational compressive force – commonly known as centripetal gravity – is so small that it cannot exert any effect on the object, because it is simply an intermolecular force of cohesion. substance – especially solids – is much larger than it is. But with very large masses, on the other hand, the force of gravity is so great that matter will rearrange until it becomes spherical. That is, the state in which the force of gravity directed at the center of the object from all directions is equal to each other. That’s how every object as large as a planet or a star gets its spherical shape. At the same time, when there is such a large mass, another problem arises, and also related to gravity. Since no single star or planet is perfectly uniform, in fact the gravitational forces in their different regions are unequal. This difference is the main reason they oscillate, and hence the rotation. Thus, all large objects in the universe rotate because of their own gravity. What about black holes? The most common types of black holes known to scientists today are stellar-mass black holes. It is formed from the late-life contraction of the cores of massive stars. These stars are usually at least 8 to 10 times the mass of the Sun. Towards the end of their lives, their cores shrink very rapidly because the fusion reaction no longer produces enough energy to resist the contraction of that enormous mass. This sudden contraction causes an explosion that is considered one of the most violent events in the universe” supernova explosion. This explosion tore apart the stellar shell that was previously in the state of a red supergiant. The remaining core of the star shrinks and collapses to become a black hole. All stars rotate on their own axis (our Sun, for example, has a rotation period of more than 25 days). It is not difficult to speculate that something formed from a rotating stellar core would also have to rotate, because that momentum is simply still there. The same is probably true of supermassive black holes – black holes with masses ranging from hundreds of thousands to billions of times the Sun, located at the center of most galaxies ever observed. In fact, when the first image of a black hole was released in 2019, scientists were able to see the spirals of the accretion disk surrounding the black hole. It shows that the giant accretion disk is rotating, not fixed. Just like the fact that all the stars in each galaxy are constantly moving around the center of the galaxy (for example, our Sun takes about 230 million years to complete one full circle around the center of the Milky Way). Two things need to be clarified before concluding that the black hole rotates on its own The entire initial mass of the black hole – in theory – is packed into an extremely small singularity. It is so small that it can mathematically be considered sizeless. That singularity has a certain radius (Schwarzchild radius) known as the black hole’s event horizon, but it is just a region of pure space-time, not an object like it has a surface. like a star or a planet. As such, it is difficult to consider something with no dimensions, or a boundary without a surface, to be rotating, since there is simply no alternate motion of points to a particular surface. No radiation comes out from within the event horizon, which also means that all information inside a black hole is unknown. If matter were indeed crushed and completely collapsed into a single point, the space within the event horizon could itself be a place of absolute uniformity, i.e. no rotation would occur due to the difference. interesting. With these two points in mind, don’t forget that what we see spinning is itself just the accretion disk surrounding the black hole. Of course, one can also calculate the rotational speed of an accretion disk based on its mass when taking into account as well as when not taking into account the presence of a black hole at the center, from which to compare and predict. It looks like the black holes in those places are spinning very fast. Even so, given that we don’t know anything about what lies within the event horizon, or even something specific happening at its very edge, concluding that black holes are indeed rotate or not and how fast they rotate is still too early. Likewise, the charge of a black hole is also a purely theoretical concept and is calculated from solving Einstein’s equations. There is no way for us to verify if an electric charge really exists after being swept inside the black hole’s event horizon. In the future, to know more about this information, we will need to look forward to new generations of telescopes and new methods to image and track more black holes with much greater detail. compared to what there are today.

One of them is the tomb of Trieu Van Vuong – the son of Trieu Trong Thuy, the grandson of Trieu Da! Discovered the tomb of Trieu Van Vuong – Trong Thuy’s son In June 1983, a worker was working on a construction site at the foot of Xianggang Mountain, Guangzhou City, Guangdong Province, when his foot fell into a pit. This pit is very deep, when colleagues shine their lights on, they only see a pitch black color like a “bottomless pit”. The other worker was lucky to be uninjured and was quickly pulled up, after which he said there were huge copper cauldrons underneath the hole. Understanding that this was an ancient tomb, the construction team quickly reported it to the Guangzhou Municipal Cultural Relics Bureau. The mausoleum is located 17m underground. Photo: 360doc. The first house is located 17m deep underground and is built of giant stone slabs. Preliminary excavation shows that the tomb has a total of 7 rooms, walls up to 12m high, on the walls there are frescoes depicting the sun and moon gods. Fortunately, this tomb has never been looted, inside there are still 10,000 cultural relics such as bronze pots, ceramics, lacquerware… The heavy heavy stone gate and 15 skeletons of people who were buried with them (concubines and servants) indicate certainly the grave of someone of the highest rank – a king. The seal revealed the identity of the South Vietnamese king Trieu Van Vuong. Photo: 360doc. Finally, the archaeological team found a seal that showed The owner of the tomb is the second king of the Trieu Dynasty of Nam Viet – Trieu Van Vuong. Trieu Van Vuong called Trieu Mat, the eldest grandson of Trieu Da, the son of Trieu Trong Thuy, who ascended the throne in 137 BC. Trieu Van Vuong’s tomb is very elaborately decorated. The king’s body lies in a 1.73 meter long jade mourning robe, made of 2291 pieces of jade, silk and linen. Jade robe is the most advanced burial costume under the Han Dynasty (contemporary with Nam Viet), only for people of noble status with superstitious belief that jade has the effect of preserving bones, keeping the body of the dead person is whole and waiting for the opportunity to be reborn. The set of jewels of Trieu Van Vuong. Photo: 360doc Trieu Van Vuong’s tomb is also buried with huge jade treasures, gold inlaid swords, bronze bells and thousands of overwhelming treasures. Currently, these relics are on display in the Emperor Zhaowen Museum in Guangzhou, China. Who is Trieu Van Vuong, son of Trong Thuy? Nam Viet was founded in 204 BC an area in Guangdong province and intersected with Guangxi Zhuang Autonomous Region. The kingdom lasted for 93 years and in turn experienced 5 kings. Trieu Da, a former general in the military regime of Qin Shi Huang, was the founder of the kingdom. According to the “Dai Viet History of the Complete Book”, Because Trieu Trong Thuy (Trieu Da’s son, An Duong Vuong’s son-in-law) had died before his father, Trieu Mat was chosen as the successor to King Nam Viet. The Emperor Zhaowen Museum in Guangzhou City, China is the place to keep a huge treasure in the tomb of the King of South Vietnam. Photo: 360doc. In his reigning life, Trieu Van Vuong did not have too many achievements, compared to his predecessor, Trieu Da, was also considered to be lack of determination and weakness. He ruled the country of Nam Viet for 12 years, always keeping the agreement with the Han Dynasty, wanting to use justice to sympathize with the neighboring country, repel the enemy, and keep the border at peace. About Trieu Van Vuong’s mother, many people will question whether Trieu Van Vuong’s mother is Princess My Chau? There are not many documents about who Trieu Van Vuong’s mother is, but the book “Thien Nam Luc Luc” – An anonymous work written in Nom script, born around the end of the seventeenth century, records that My Chau had a son. This boy is very much loved by his grandfather, An Duong Vuong, and the king plans to pass the throne to him in the future. However, this boy was brought home by Trong Thuy when he used the excuse to visit his parents, but expressed that in case someone inherits his family line, something should happen. In this case, it is possible that Trieu Van Vuong’s mother is Princess My Chau! Let’s look at the burial items in the tomb of Trieu Van Vuong: The mausoleum owns more than 10,000 burial items. Photo: 360doc.

Humans have only found about 5% of the composition of the universe. So what is the remaining 95%? Although we know of its existence, we cannot see or study it specifically, directly because these components are invisible. Science fiction still frequently mentions the existence of other universes. In fact, in recent years, the scientific community is gradually accepting this hypothesis. A typical example is the multiverse theory, which comes from William James’s term of the same name in 1895. Accordingly, it is said that there are many parallel universes along with the one in which we live. The origin of cosmic rays has puzzled astronomers for a long time, who have spent a century studying the origin of these charged particles. However, the origin of this mysterious phenomenon remains an unanswered question. Since the birth and development of space science, a question that has always bothered the whole human society is whether there is anyone outside of Earth? Humans have launched spacecraft, explored many planets in search of other life, but so far, the above question has not been answered. Life likely existed on Mars and may even exist today. Mars used to have vast oceans. Scientists have found evidence that liquid water is still periodically flowing on the surface of Mars. Many countries are planning to send explorers to Mars to find the answer tree to this problem. Solar physicists have been baffled by the mystery of the Sun’s ability as it reheats its corona, the fragile crown surrounded by light that emerges brightly during a total eclipse. Crystal rain is a mysterious phenomenon that can only be seen in the universe. The star HOPS-68 is a star that closely resembles the Sun at its inception. Around this star exists a cloud of dust and gas, of which the main component is green olivine crystals. Due to the rather cold temperature of these dust clouds (about -170 degrees Celsius), the olivine crystals condense into small particles and fall like a magically beautiful blue crystal rain. Black holes are one of the great mysteries of the universe. This entity is one where the density of matter is greater than any other entity in the universe. With its huge weight, the black hole can bend time and space and nothing can escape if it accidentally falls into its gravitational field. Astronomers estimate that the Sun will destroy the Earth in about 6 billion years. Several theories about the end of the universe have been put forward. The universe can perish when all matter in the universe has the same temperature. That means all stars will perish and all matter will perish. Another opinion is that an event contrary to the Big Bang, the Big Crunch, will occur. If the universe continues to expand, eventually gravity will become too great, causing everything to contract. The entire universe will become a solid mass and the universe will come to an end. There is a mystery about the moon that has puzzled astronomers for a long time. That’s why only certain parts of the moon’s surface appear to have magnetic fields. But after conducting many tests and analyzing the moon’s surface, scientists believe that the moon once had a magnetic field – about 450 million years ago. Femi bubbles are giant and mysterious structures that arise from the center of the Milky Way and span about 20,000 light-years, accompanied by intense gamma rays and X-rays. Since it was first discovered until now, the Fermi Bubble has caused astronomers around the world a headache because it has not been able to find the origin of this giant gamma-ray structure. Please watch the video: NASA astronauts drop a mirror in space. Source: VTV