We have talked about so many articles about the popularization of science in the universe before, and some friends have been asking me, I want to know the most basic knowledge about the universe, can you talk about how big the universe is, I am not an astronomer, even if I am an astronomer, I don't know how big the universe is, according to the current detection technology of human beings, it has exceeded our cognitive concept, but we have not detected the end of the universe.
At the beginning, I will tell you about the specific location of our earth's home in the universe, and remember that we are in "the Raniakea Supergalaxy Cluster Virgo Galaxy Cluster in this universe Milky Way Orion Coin the third planet Earth of the solar system", this is the address of the earth in the universe, what is the science of the universe: this universe is the general name of all visible galaxies, followed by your home address, which is a super cow universe address, and the aliens will go to your home as a guest in the future to tell this address to find your home.
Let's use this address to analyze how big the universe is, let's analyze layer by layer, first of all, the solar system, the third planet, the earth, this everyone must understand, follow my footsteps to the deeper universe too to explore, this is a layer of the Milky Way Orion Arm, the Milky Way is a cantilevered galaxy, the Milky Way has four large spiral arms, namely the swan arm, the eagle fairy arm, the centaur arm, Southern cross arm, these big spiral arms have nothing to do with us, they are out of a small place for the time being, we are located in the Orion arm, the Orion arm is a relatively small spiral arm, don't underestimate this spiral arm is small, the earth is located in this spiral arm feng shui excellent location. The location of the earth happens to be the most sparse place in the entire spiral arm planet, which is also the best place to breed life, and it is theoretically difficult to produce life in the place of all planet cheats, and you can make up for the specific reason.
The radius of the solar system reaches two light-years, so how big is the Milky Way?The diameter of the Milky Way is 100,000 light-years, so the Milky Way is a small dot in the Milky Way, and our Solar System is exactly halfway up the radius of the Milky Way, about 250,000 light-years left, so it takes about 500 million years for Voyager to fly out of the Milky Way, and it takes 20,000 years to fly out of the solar system, there are about 200 billion to 400 billion stars in the Milky Way, if every star is like the sun, there is a galaxy around it, there are 200 billion to 400 billion small galaxies in the Milky Way at that time, for the universe, although there are a lot of them, they are too small, like countless dust in a huge space.
The nearest galaxy to the Milky Way is called the Andromeda Galaxy, the Andromeda Galaxy is twice as large as the Milky Way, the largest galaxy known in the universe is ten times larger than the Andromeda Galaxy, called IC1101 galaxy with a radius of 2 million light years, the Andromeda Galaxy is 2.5 million light years away from our Milky Way, and is currently approaching at a speed of 120 kilometers per second, and it is expected that the Andromeda Galaxy will collide with our Milky Way and merge into a galaxy in 2 billion to 4 billion years. The collection of stars is called galaxies, and the collection of galaxies is called galaxy groups, our Milky Way and Andromeda galaxies, plus a triangulum galaxy, and some small galaxies around them are combined to form the local galaxy group, the diameter of the local galaxy group reaches 10 million light years, and the galaxy group and more than 100 galaxies are put together to form the Virgo supercluster, which is about 1 in diameter100 million light-years, before 2000, this was the composition of the galaxy as we knew it.
In 2014, a research team from the University of Lyon 1 and the University of Hawaii in France discovered that the Virgo Supercluster we are in has a larger structure on the outside, and this larger structure is called the Laniakea Supergroup, which has a diameter of 5200 million concepts, 5 times larger than the Virgo supercluster, the Laniakea supercluster contains three superclusters, namely the Virgo supercluster, the Serpent Centauri supercluster and the Peacock-Indian supercluster, these three superclusters were originally independent groups, and then they themselves got closer and closer, and later scientists found that in the middle of these three superclusters, there is a place for gravitational anomalies, the scientific name of this place is the giant gravitational source, what this huge gravitational source is still unknown. But he must be much larger than very well, and it is a very large gravitational field that is very common in the whole universe.
There are 10 million superstars in the universe, such as Laniakea, which together form the universe that we can see now, and how big is the universe known now?The radius is 46.5 billion light, the diameter is 93 billion light, this range is called the observable universe range, see here do you have a question about the most basic common sense question, the age of the universe is 13.8 billion years, according to the calculation of light years, our farthest detection distance should be within 13.8 billion, more than 13.8 billion light years also means that our detection technology operates faster than the speed of light, this must be against the laws of physics, so how did we detect the diameter of the universe of 93 billion light years, and share it with you in the next issue！
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