We're no strangers to the term "black hole", especially since we've been taught the relative basics of physics in compulsory education. Black holes are the largest objects in the universe, according to the law of gravity, the gravitational pull of a celestial body and the mass of each other, and the mass of the black hole and infinite, so it has a particularly strong gravitational pull on all the celestial bodies themselves, some scientists analyze, when people are infinitely close to the black hole, the speed of the fastest can reach the speed of light.
But contact us as a child to contact the black hole information, you will find that the black hole in fact, there is no photo, most of his about the map is just imagined out of the picture, and the real black hole in fact what is like, in fact, we have never been clear. Why is it so difficult to take a photo of a black hole, watermelon video creator Mr. Li Yongle in the work of the first black hole photo how to shoot? Event horizon telescope EHT is what? Mr. Li Yongle told you in a detailed science, interested friends can search on the watermelon video, to explore the truth of shooting black holes.
Simply tell us the principle of the telescope or camera, in fact, the two are similar, are the use of optical lens imaging, and the camera is different, it will have a photographic negative imaging (of course, now the camera is a digital camera, has been less use of the camera has a negative), through the development of the human image will be formed.
When the natural light on our people and the surrounding scenery, will be reflected to the camera lens, we can capture the image through the shutter exposure to the moment, so in fact, the most important thing to take pictures is to use the light source. We have seen that some of the particularly elaborate shooting sites require the use of a light shield, which is to ensure that there is enough light to achieve the imaging effect.
Black holes are different, as we mentioned before, black holes have infinite gravity, even light can not escape, and the light to the black hole is not able to be reflected, it will be absorbed, so we can not take a picture of a black hole through a simple photographic principle, and even ordinary optical telescopes, can not be found in the existence of black holes.
Man's understanding of the universe has progressed with the progress of science. At the beginning of the observation of the universe, people can only feel with the naked eye, and then after the telescope, we can observe through the telescope, but the resulting bias is also very large, because the Earth's atmosphere will have refraction. When satellites were invented, human beings thought of a good way to launch the telescope directly outside the Earth's atmosphere, so as to avoid the interference of the atmosphere.
Of course the early observation of celestial telescopes, the same optical telescopes, through the reflection of light emitted by stars in the universe, to observe the stars and planets in the universe, but similar to black holes such as celestial bodies, optical telescopes will not be able to see it at all, so human beings in the long process of scientific research and invented the radio telescope. The reason why shooting black holes can be successfully realized, it all depends on radio telescopes.
Radio telescopes and optical telescopes are different, optical telescopes are the use of reflected light, and radio telescopes are used to perceive the celestial radio waves, of course, because the light is essentially a wave, so the principle of radio telescopes and optical telescopes are almost the same, he will feel the radio waves through the amplification, and then through the data, the feeling of celestial bodies, but want to shoot black holes, but is not such a easy.
To photograph a black hole, eight radio telescopes are used, **** together to form an "event horizon telescope". After the invention of radio telescopes, it was relatively easy to observe black holes, but they were only limited to those with a large mass, because the larger the black hole, the stronger the radio waves emitted, and the easier it was for people to perceive them, so if you wanted to take a picture of it, you had to choose one of the larger black holes.
But there is another key factor, that is, the distance, the distance of the black hole must be appropriate, just like when we take pictures, there will be different degrees of focus is a reason, the distance is appropriate in order to take pictures of black holes, so at that time, scientists chose the center of the M87 galaxy black hole, after 5 days of observation, and finally measured the data of this black hole, about 4Pb.
So The amount of data was so large that it took scientists nearly two years to analyze it before they could completely restore the black hole. The size of this processed photo of the black hole is more than a few gigabytes, which is the result of the efforts of too many people behind this photo of the black hole! Watermelon video creator Li Yongle teacher in the video first black hole photo how to shoot? Event horizon telescope EHT is what? Mr. Li Yongle told you from a professional point of view to explain the working principle of the radio telescope and the principle of taking photos of black holes, want to know what a black hole photo looks like, why black holes are so difficult to study? You can search for the keyword black hole photos on watermelon video and watch the original video to find the answer.