This paper takes part in the series essay competition of “great science” of Recordunkown.
There are numerous kinds of celestial bodies in the vast universe. Stars, planets, neutron stars and so on are relatively common celestial bodies. With a large number of celestial bodies, collisions are inevitable. In fact, in the vast universe, collisions of celestial bodies occur every moment. It is only because the universe is too big and the distance between celestial bodies is far away that collisions of celestial bodies seldom occur.
If we reduce the universe to the size of the solar system, you will find that there are all kinds of light from collisions everywhere, which will be a very beautiful picture. There is such a saying in the scientific community that “life comes from countless collisions of celestial bodies”. Why do you say that?
Scientists believe that when the earth was formed, like other celestial bodies in the solar system, it was a desolate planet without liquid water and life. Later, the earth was constantly collided by various celestial bodies. These asteroids or comets brought water to the earth, and also brought elements of life, so there will be a vibrant blue planet behind.
There is no basis for the above conjecture. According to scientists’ research on the earth’s materials, the earth, like most rock stars, is mainly composed of silicate, but the earth lacks sulfur, an essential element for life. Therefore, some scientists believe that the sulfur on the earth is brought about by the impact of foreign celestial bodies on the earth.
Not only sulfur, but also many other metals may be brought about by collision. For example, gold, which everyone likes, may be left on the earth after debris from foreign celestial bodies hit the earth. According to conjecture, scientists believe that a large neutron star collision took place somewhere outside the solar system 4.3 billion years ago. A large amount of gold and other materials produced by the collision were ejected, and just a part of them came to the earth.
Scientists believe that in the early days of the earth, there was a “golden rain” on the earth. The so-called golden rain is actually what is now called meteor shower, but the fragments of celestial bodies are made of gold. After the golden rain, the earth’s surface was covered with gold. Later, with the movement of the crust, most of the gold went to the depth of the crust, and only a few left the surface.
According to the ultra deep drilling experiments of scientists, the gold layer is indeed found in the deep crust, which indicates that there are gold reserves far beyond the surface in the deep underground. If the gold can be mined out, the price of gold may also drop significantly, from the original high-value material to ordinary value material.
The collision of celestial bodies in the universe is not limited to asteroids, but the collision between planets. Maybe many people think of asteroids hitting planets when they talk about celestial body collisions. Indeed, in the solar system, planets have their own fixed and stable orbits, and there has been no collision for billions of years. Only if the asteroid’s orbit is unstable, it will often break away from the stable orbit and hit the planet.
But looking at the whole universe, asteroid collision with planets is nothing at all, really terrible star collision, neutron star collision, black hole collision and so on. These collisions are the most intense collisions, bringing energy levels far beyond our imagination. Scientists can often observe some strong collisions deep in the universe through astronomical telescopes.
We should know that the vast universe is based on light years, and the deep collisions in the universe can be observed by us, which indicates that such collision energy level is quite high, and such energy level can easily destroy a galaxy. G & ouml; tzgr & auml; Fener, an astronomer at the University of Bonn in Germany, accidentally discovered a potential mysterious celestial body when he was observing Cassiopeia with an infrared telescope, hiding a burning star behind a broken nebula.
However, this nebula does not emit any visible light, but the infrared radiation is surprisingly high, which indicates that the object in this nebula has run out of hydrogen fuel. It is a transparent white dwarf. Under normal circumstances, the brightness of white dwarfs is relatively weak, and white dwarfs are also known as death stars.
The reason why it is so called is that after a star of ordinary size runs out of fuel, the outer material will separate and the inner material will collapse inward. This kind of extension and contraction makes a star of ordinary size only evolve into a white dwarf. If it is a star with a larger mass, it will become a neutron star after the helium flash, and a star with a larger mass will eventually evolve into a more powerful black hole.
White dwarfs are different from neutron stars and black holes. Neutron stars and black holes are very active, but white dwarfs will run out of fuel and eventually become a dead star that will not emit light and heat. Therefore, in the universe, we will observe many neutron stars shining with extremely bright light, but few white dwarfs. The reason is that white dwarfs will eventually become dead stars, which is extremely difficult to observe. We can only observe them before they become dead stars.
Under normal circumstances, once a white dwarf becomes a death star, its fate will come to an end and there will be no more dazzling light. But there are exceptions. If two white dwarfs collide unexpectedly, the situation is totally different. The impact of the white dwarf will reconstitute the matter inside, and the two white dwarfs will merge into a new star.
Stars are living objects, so two white dwarfs will be revived after collision. This is a magic thing, but the stars formed by the collision of white dwarfs are different from the stars we know. Such stars do not emit visible light, but only produce strong infrared radiation. For example, the new star observed by scientists is formed by the collision of two white dwarfs. Its infrared radiation is more than 40000 times that of the sun, and it throws out super stellar wind at the speed of 5800 km / h, which is more than twice as strong as the sun.
Of course, such a white dwarf collision event is also very rare in the universe. The reason is that the distance between stars is very far, ranging from a few light years to hundreds or thousands of light years. If there is a white dwarf collision, the predecessor of the galaxy will be at least one binary system, and only the galaxy above the binary system will have more than two stars.
If a galaxy is a binary system, and two of its stars are ordinary sized stars, they will all evolve into white dwarfs when their lives come to an end. Because the distance is relatively close, it is possible to get closer and closer under the action of gravity, and finally collide, so as to merge into a new star and get rid of the fate of becoming a forever dead star.
Guys, what do you think of this? Welcome to leave a message below to discuss and express your opinions.