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Astronomy There are about 40 million, 000 black holes in the universe. The number of black holes in the universe is one of the urgent questions to be answered in the field of modern astrophysics and cosmology. In a recent study published in the Astrophysical Journal, scientists calculated for the first time that the number of constant-star black holes (with masses ranging from a few to hundreds of solar masses that originated at the end of the life of massive stars). Most black holes in the universe belong to constant-star black holes, and it is estimated that there are about 400 billion black holes in the observable universe.
By gaisndm Hawkshaw4 years ago in Earth
An alien spaceship just passed by. Solar system scientists are going to catch up with it.
In 2017, astronomers discovered an uninvited guest in the solar system: the interstellar rock Omaomo, which is the first time a celestial body from outside the solar system has been observed to enter the solar system. However, some of the strange properties of Omaomo seem to suggest that it is not formed naturally, and some scientists even boldly speculate that it is an alien ship that intruded into the solar system to gather information near Earth. Now that Aomomo has moved beyond the orbit of Neptune, in order to reveal its true face, some scientists have proposed that we should launch a probe to catch up with Omaomo and take pictures of it.
By jsyeem shekels4 years ago in Earth
Can the train for brain death turn back temporarily?
"the station ahead is brain death." When a sudden cardiac arrest occurs in humans, there is no blood supply to the brain and oxygen cannot be transported, which will cause hypoxia in brain cells. Our brains are very sensitive to this, and if we continue to lack oxygen, brain death may occur in about 10 minutes.
By gaisndm Hawkshaw4 years ago in Earth
One pressure cooker can blow up two cars. I didn't know the power of the pressure cooker until I watched the beginning.
Who DNA moved. | | Image source network | There is a story in the words "just blown up". | | Screenshot of Douban And an improperly used pressure cooker can indeed go beyond the scope of a pot and become a "weapon" that threatens the safety of the kitchen and even personal safety.
By gaisndm Hawkshaw4 years ago in Earth
You can sense not only the sixth finger, but also its length.
The brain allocates neurons that regulate sensation or movement to parts of the body, so it can be said that the brain contains a map of the body, but studies suggest that it may not be so "reliable" at times. In 2016, a scientist conducted an experiment that made subjects think they had a sixth finger on one hand, and another shouted: "Witchcraft!" But the illusion only lasted a very short time. So another research team decided to repeat the experiment and managed to extend the duration of the illusion, which was published in 2020 in the journal Perception. The team then published a new study in 2021 in Cognition: they not only gave subjects the illusion of a sixth finger, but also managed to control the length of their perception of a finger they had never seen before.
By jsyeem shekels4 years ago in Earth
These people never feel full, but the problem lies in their cerebellum.
Prad-Willie syndrome (Prader-Willi syndrome) is a rare genetic disease in which people never feel full. This lack of satiety can lead to severe obesity, which in turn leads to life-threatening diseases. Although the fist-sized cerebellum has never been linked to hunger before, scientists have found that the cerebellum plays a key role in regulating satiety in patients with Prad-Willie syndrome.
By gaisndm Hawkshaw4 years ago in Earth
Water is good for all things but not for dispute. | Wang Yanxin
Water is the source of life. From the point of view of geoscience, the water on the earth moves under the action of solar heat energy, earth gravity and molecular energy, and the phase changes occur constantly, from the troposphere of the atmosphere to the depth of the lithosphere, forming a hydrosphere tens of kilometers thick, which has become a basic feature that distinguishes the earth from other planets.
By Fwuebks Sushma4 years ago in Earth
[Earth interview] Academician Li Tingdong: science popularization is the biggest public welfare project.
General Secretary Xi Jinping said that scientific and technological innovation and scientific popularization are the two wings for realizing innovation and development, and scientific popularization should be placed in the same important position as scientific and technological innovation. Without the general improvement of the scientific quality of the whole people, it will be difficult to establish a grand army of high-quality innovation. " Academician Li Tingdong has a lot to say about the importance of science popularization.
By Fwuebks Sushma4 years ago in Earth











