Since the astronauts first saw outer space when they entered Earth orbit in 1950s, human beings have entered a brand-new space age. With the continuous progress in the way of exploring the universe, human beings have encountered many incredible things in space exploration. Let’s take a look at 15 cold knowledge that human beings have encountered in exploring the universe.If we can practice these points, 太空探索 Will be unique, become a leader in the industry, and keep moving forward. https://www.zhanmeng.net/
1. There are laws in space.
You may not know that space is also subject to legal restrictions. In the 1960s, after humans entered space, space laws were formulated, mainly to ensure that space would not become a war zone and a testing ground for other destructive weapons.
2. Wrong image of the cave of the Patriarch.
The Capricorn Hole is a special area where scientists find that galaxies are extremely rare in the universe. However, the picture of the Capricorn Hole that people usually see is actually the Barnard 68 Nebula in Ophiuchus. The dark part in the middle is because the nebula blocks the illusion formed by light. The real Capricorn Hole is like the picture on the right. There are only more than 60 galaxies in the whole area, while there are at least 10,000 galaxies in other such spaces.
3. The human body can only live for 15 seconds in space.
Without the protection of the spacesuit, the human body can only survive for about 15 seconds in the pressure-free environment in space, which is the time that the oxygen in the body can be maintained. In this short time, it will experience blood boiling, body expansion and unconsciousness, but it will not be frozen at low temperature so quickly.
4. Blue sunset on Mars
Mars is the planet closest to the earth’s environment in the solar system. Curiosity probe showed a strange blue sky when shooting the sunset on Mars. NASA researchers said that because the dust particles in the Martian atmosphere have stronger ability to scatter blue light than other wavelengths, if the atmosphere contains water, it will be as dazzling as the earth.
Human footprints on the moon will exist for 100 million years.
Although the surface of the moon is covered with thick dust, the environment of the moon will hardly change. If only by natural erosion, the footprints left by astronauts on the moon can exist for at least 10 million to 100 million years.
6. Extremely cold environment in space
In the universe, the place where the stars can’t shine is very cold, and the lowest temperature will be infinitely close to absolute zero -273.15≧. At present, the coldest place known is the boomerang nebula, which is 5000 light years away, and the temperature here is only -272.15≧. In fact, the average temperature of the universe is only -270.42≧.
There are about 10 trillion galaxies in the universe.
At present, it is known that the Milky Way is only one of more than 2,000 galaxies in the Virgo Cluster. At present, there are no less than 10 trillion galaxies in the observed universe. Even so, the distance between galaxies is still very far, and the light of many galaxies has not yet reached the Milky Way under the constant expansion of the universe, so it cannot be discovered by human beings.
8. Size of the International Space Station
The space station is the largest man-made object launched into space by human beings. The weight of the International Space Station is an astonishing 840,000 kilograms, and the overall length is 109 meters, which is equivalent to the size of an ordinary football field. It was jointly manufactured by 16 countries.
9. The high cost of launching materials into space
The cost of transporting materials to the space station is very high, about $9,100-43,180 for each pound (about 453 grams) of goods sent. In July this year, Russia sent 2.5 tons of goods to the International Space Station, which can be said that the launch cost alone is an astronomical figure.
10. Sound in the universe
Space is not an absolute vacuum environment, but there are still particles and thin gases. NASA converts all kinds of signals in the universe into audio tracks through “data audibility” technology, and finally “listens” to the sounds made by various celestial bodies in space, but these sounds are very low and far below the limit that human ears can hear, and the original audio tracks must be amplified to hear them, so these sounds sound low, strange or particularly sharp.
11. Powerful magnetar
Magnetar is a special neutron star with a strong magnetic field. It can suck all the metal objects from you at a distance of 400 kilometers. Even the iron in your blood will be sucked out if you continue to approach.
12. Most parts of the universe are dark
After the Big Bang, the universe continued to expand, and the expansion speed even exceeded the speed of light, which led to the fact that the light in most places had not yet arrived in the 13.8 billion years since the birth of the universe, which is why human beings are always so dark when observing space.
There are many black holes in the center of the galaxy.
There is a supermassive black hole in the center of most galaxies. In fact, the number of black holes in the center of galaxies may be as many as tens of thousands. Scientists have found that there are a large number of small black holes around the black hole in the center of the Milky Way. These black holes have gathered a large number of material rings, which makes the center of the galaxy appear extremely bright.
14. Contact between the Milky Way and Andromeda
Although Andromeda galaxy has been approaching the Milky Way, it will take 4 billion years before the two galaxies collide directly, but Hubble Space Telescope has observed that the gas around the two galaxies has contacted, or the process of mutual fusion between the two galaxies has begun.
Everything in the universe is spinning.
From the operation of galaxies to the rotation of electrons around the nucleus, everything in the universe is rotating, and all the rules are based on this wonderful circular motion-starting from the starting point and eventually returning to the starting point.
