Canada Hankook Ilbo: Black Hole


Blackhole M87

Demonstrating theoretical existence as a visual reality
55 million light-years, 40 billion kilometers in diameter
Korean scholars also contributed
Two hundred academics from around the world join forces
Mobilize 8 x-ray telescopes on Earth


A commonly known black hole is a destructive entity that sucks out light and can not escape it. But this is not true if the professional physicist knows more about it. It is also called a black hole. To get out of Earth's gravity, there is a speed of 12 km per second, but the black hole's gravity sucks out all light at 300,000 kilometers per second, the fastest in the universe.

The first concept of the black hole arose about 100 years ago in 1916 when Einstein published the principle of general relativity that gravitational pulling force refracts light to a straight line and therefore decreases time. In other words, light is born in the universe and time begins at the same time, so it is the theory that light and time are the same, and time changes when the speed of light changes.

If there is no light (including electronic wavelengths) then there is no time in it. This theory was considered to have been made only by the imagination until 1930. It was a black hole. Einstein, who first encountered the concept of black holes, denied that "black holes can not exist."

Chandrasekhar, an Indian astronomer who studied astronomy in 1935, stated that "when a star like the sun dies, it can no longer emit light, its size decreases globally, but its gravity increases." This is the white dwarf & # 39; This is the first time that the theory suggests that a black hole can actually exist, although the volume is small, but the gravity of the attraction is so great that the weight of each sugar (1 cubic cm) is 100 kg.

But at that time, this dwarf could not be found with the telescope. Since the birth of the universe was 13.8 billion years ago and at the same time many stars were born and the lifetime of the star is about 10 billion years, many dwarfs, most scholars therefore did not believe in his theory. However, in 1939, this was discovered for the first time and surprised the academic world. Since then, it has been discovered and has now found 9,000 dwarves in the galaxy. So does the end of the star end with that?

No The dwarf is composed of helium and carbon atoms, even when contracting, but as gravity increases and atoms disappear, it is assumed to be a black hole. In support of this, in 1968, all atoms were destroyed and a neutron star was discovered, consisting of only a small particle called the neutron. The diameter of this neutron star is only 4 kilograms, which is the contraction of the sun star of 1 million kilometers in diameter. However, pulling by gravity is unimaginably large, so the weight of every square centimeter of sugar cubes is estimated at 5 trillion tons. When white dwarfs and neutron stars were discovered, physicists who were skeptical of black holes could not help believing.

In addition, in ancient history, there are records that "there was a flash of day and night in the night sky." The fact that this is an explosion of Super Nova is proven since the late twentieth century. This is a phenomenon where neutron stars explode. If this is blown out, a second generation star will be born, but if it explodes in, nothing will be left. In the vicinity of the disappearance site, stars and stars are constantly drawn to what is being rocked. Scholars conclude this place as a black hole.

In the late 20th century, an astronomical X-ray telescope was opened to observe the interior of a gas cloud. I watched the Chandra Telescope, called Dr. Chandra, out of the atmosphere, and discovered that almost every galaxy had a black hole in the center of the solar system. However, I could not get a photo because there was no light from the black hole.

In recent years, scientists around the world have found a slight curve in the black hole of the Milky Way, called M87 (weight 6.5 billion times the mass of the Sun) in the group of Virgo galaxies, about 55 million years- light away. The problem was that the amount of curved light was so small it could not be called a black hole, even if it were photographed. Over the past two years, researchers have performed more than 40,000 images with eight X-ray telescopes installed in Antarctica, Chile and Spain.

I took these pictures on a sheet and edited them to take pictures of black holes with a diameter of 40 billion kilometers. The photograph of the first black hole is impressive, but the efforts of astronomers are also remarkable. [이 연구에는 한국학자들도 공헌한 것으로 보도됐다.]



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