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1. Different network architectures:

decentralized application (DAPP) runs on the distributed network, the information of participants is protected (or anonymous), and the decentralized operation is carried out through different people in the network nodes. Distributed network is made up of node computers which are distributed in different places and have multiple terminals. When any line in the network fails, the communication can be completed through other links, which has high reliability

traditional app needs services provided by third-party service providers, and can achieve wireless network access through mobile communication network, which belongs to the centralized network architecture mode

2. Different from open source:

DAPP applications must be open source. Most of the tokens issued by DAPP run independently rather than controlled by an entity. All data and records must be encrypted and stored on a public and decentralized blockchain

traditional app software, games, navigation and other applications are generally provided by third-party service providers, which should solve the problems of right protection and economic interests, and their programs are not open source

extended data

in 2018, a large number of new DAPP projects were launched. According to the statistics, there are about two or three thousand dapps in the whole network. According to the DAPP survey of fluence labs, 72% of DAPP projects were launched in 2018. This means that in the past year, the number of dapps in the whole network has more than tripled

of all dapps, more than 80% are developed on Ethereum, about 20% on EOS and less than 10% on Tron. It is worth noting that about 10% of the projects are developed on multiple main chains at the same time, while the number of dapps developed on other main chains is relatively rare

there are about ten projects based on gxchain, mainly small applications in block city

The great Magellanic nebula is about 180000 light-years away, the Magellanic nebula is 210000 light-years away, and the bright star on the lower left is the base of the ship α Old man star, a resident of the galaxy, is only 310 light-years away. Both big and small clouds are in the southern half of the sky, and the sphere is about 20 meters away from the southern pole ° Right and left. Located at the junction of the two constellations, Xiphophorus and Yamagata, the cloud spans the two constellations and occupies 8 °× seven ° The area of the sky is equivalent to the apparent area of more than 200 full moons. The wheat cloud is located in Rhododendron, occupying 4 °× two ° It's the area of 30 full moons. The distance between the barley cloud and the wheat cloud is about 20 meters ° In the southern hemisphere, the big and small wheat clouds hang high near the zenith of the southern sky all the year round. They never fall below the horizon. As we see in the northern hemisphere, the Big Dipper will never fall below the horizon. They are a pair of treasures of Nantian. Unfortunately, most of the northern hemisphere can't see them. In the Spratly Islands area of China, they are only found near the southern horizon.
the Magellanic nebula is a small and irregular galaxy. It is a satellite galaxy of the Milky way and orbits around the Milky way once every 1.5 billion years. Because it has no standard fixed shape, the Magellan Nebula has become the most controversial object in the southern hemisphere, even the most imaginative object. Some astronomers say that the Magellanic Nebula seems to interact with dark matter in the universe to form a galaxy bend
what is galactic curvature? I think this is more difficult to explain. To put it simply, the operation of nearby nebulae may have an impact on our galaxy, just like the agitation of the other end of the carpet, which can cause a wave like shape distortion. At present, the Galactic silver plate has become a bowl
apart from the rosy Keyhole Nebula and the shining Southern Cross, the most famous celestial bodies in the southern hemisphere belong to the large and Small Magellanic galaxies. The Milky way is not visible in the Chinese mainland. These two celestial bodies are the galaxy of the galaxy. Like M32, NGC205, next to the M31, is a small galaxy near the big galaxy. LMC is 160000 light-years away from the earth, and SMC is 190000 light-years away from the earth
when German Amateur Astronomer Tonghao came to Australia to observe stars, he mistook LMC and SMC for two "clouds" in the sky. How can the wind not blow away? It was a joke. Ngc104 next to SMC is another good object to watch, and the spider Nebula next to LMC should not be missed
like our Milky way, Magellanic Clouds also include gas and stars. Barley cloud belongs to the dwarf spiral galaxy or irregular galaxy, and its mass is 1 / 20 of that of the Milky way. Wheat cloud is an irregular galaxy or an irregular rod dwarf galaxy with only 1 / 100 of the mass of the Milky way. There are abundant gases in magellanic clouds; The mass of neutral hydrogen is 9% and 32% of their total mass respectively, which is much larger than that of the Milky way. This suggests that they are less evolved than the Milky way. Their interstellar st content is less than that in the Milky way, while the young group I has a large number of objects, with a large number of high luminosity O-B stars; In addition, new stars, supernova remnants and X-ray binaries have been observed. For example, a supernova (SN 1987A) in the Large Magellanic Cloud was discovered on February 23, 1987. Its maximum brightness is 250 million times that of the sun. It is considered to be the brightest supernova in 383 years. Magellanic Clouds orbit the Milky way once every 1.5 billion years. Every time it gets closer to the Milky way, its stars and gases will change under the gravity of the Milky way. The Magellanic Cloud has now been torn apart and its stars will become part of the Milky way. The big magellanic cloud will eventually be the same fate
the large and Small Magellanic nebulae are the closest neighbors to the Milky Way galaxy. For hundreds of years, these two nebulae have been considered as companion galaxies of the Milky way. But a new study by Harvard astrophysicist gurtina besla and his colleagues shows that the Magellanic Cloud is a recent arrival and the first visitor to the galaxy
the two nebulae are not only irregular in appearance, but also like volcanic clouds. The Large Magellanic nebula is 160000 light-years away from the earth, and its diameter is about 1 / 20 of that of the Milky way; The Magellanic nebula is 200000 light-years away from earth and is only a few hundredths the size of the Milky way
many years ago, astronauts claimed that the three-dimensional velocity field of the Magellanic Nebula passing through the Milky way is much larger than before. There are two explanations for this phenomenon: 1) the Milky way is much larger than before; 2) the Magellanic nebula is not constrained by the gravity field of the Milky way. But further research by besla and his colleagues confirms the second view, and they claim that the Magellanic Nebula passed through the Milky way for the first time
however, such observations are still questionable. Because if we take the Milky way as the reference plane, the warping depth can reach 10000 light-years up and down. But these two nebulae only arrived once a billion or three billion years ago, so their gravity tides are unlikely to cause such warping. Faced with such a situation, besla said: "we still have a lot of unsolved mysteries. When an answer appears, there may be more problems."

Why are "galaxy" and "galaxy" two different concepts? Do you understand

from the earth, because the human eye can not distinguish the dense stars, it is regarded as a silver ribbon, which is what we call the Milky way. The Milky way also got its name. So the concepts of galaxy and galaxy are different

later, astronomer Shapley observed about 100 globular clusters. His statistics show that globular clusters within the constellation Sagittarius account for 1 / 3 of the total clusters, while more than 90% of the globular clusters with

are distributed in the half of the celestial sphere centered around Sagittarius. This result aroused Shapley's conjecture. Assuming that globular clusters and stars are symmetrically distributed in the Milky way, and the center of the Milky way is the sun, then the globular clusters in the sky seen by people on earth should be symmetrically distributed. However, the observation results are inconsistent with it. Shapley wondered if there was another possibility that the sun was actually far from the center of the galaxy. In this way, the globular clusters that people see on earth will show asymmetric distribution

the truth of locust swarms in the Milky Way: where does the Milky way look like

"transverse ridge and lateral peak are different in distance and height. I don't know the true face of Lushan Mountain. It's only because I'm in the mountain. "

this famous poem shows the embarrassment that people in it are difficult to have a panoramic view of things. It's really insightful and vivid! Since ancient times, people have always wanted to know what the world is like, but the ancients could only stand on the earth and observe the earth. How could they see the true face of the earth? Regarding the round earth as a flat land, the ancients believed that "the sky is round and the place is round"

we know that the earth is spherical, because satellites that jump out of the earth can take pictures of the earth for us. But up to now, the human detector has just crossed the edge of the solar system, and human beings dare not think when they can jump out of the galaxy. So how did the face map of the galaxy come from

these questions are true. The full picture of the Milky way is not seen and photographed by telescopes, but drawn by scientists. In other words, the appearance of the Milky way is speculated by scientists

then, is there any reason for scientists' Conjecture? In fact, before we jump out of the earth, human beings have already inferred that the earth should be spherical through measurement data and navigation experience. After the human satellite jumped out of the earth's atmosphere, the real face of the earth was indeed spherical, which proved the previous conjecture. It can be seen from this that although we can't jump out of the Milky way to see the whole picture of the Milky way now, we can also make some conjectures about the appearance of the Milky way according to the information we have

the side of the Milky Way looks like a convex lens.

if we talk about the nearest extragalactic galaxy, many friends may first think of Andromeda galaxy, but in fact Andromeda is not the nearest galaxy to us, it is 2.4 million light-years away from the Milky way, And the real little companion of the galaxy is what we're going to talk about today: the Magellanic nebula

in 1912, American astronomer Leavitt discovered the relationship between the circumference of the Cepheid variable of the wheat cloud, and herzpron and Shapley immediately determined the distance of the wheat cloud, becoming the first confirmed extragalactic galaxy. The distance of big wheat cloud is 160000 light years, and that of wheat cloud is 190000 light years. They are 50000 light years apart in space. Magellanic nebula is a small and irregular galaxy. It is a satellite galaxy of the Milky way. It orbits the Milky way once every 1.5 billion years. Because it has no standard fixed shape, the Magellan Nebula has become the most controversial object in the southern hemisphere, even the most imaginative object. Some astronomers say that the Magellanic Nebula seems to interact with dark matter in the universe to form a galaxy bend

what is galactic curvature? I think this is more difficult to explain. To put it simply, the operation of nearby nebulae may have an impact on our galaxy, just like the agitation of the other end of the carpet, which can cause a wave like shape distortion. At present, the Galactic silver plate has become a bowl. The Magellanic Cloud is similar to the Milky way, which also contains many gases and stars. Barley cloud is a dwarf spiral galaxy or irregular galaxy, with a mass of 1 / 20 of the Milky way. The wheat cloud is an irregular galaxy or an irregular rod dwarf galaxy with only 1 / 100 of the mass of the Milky way. Now the wheat cloud has been torn apart and its stars will become part of the Milky way

until modern times, some scientists questioned: the Milky way is too big, light from one side of the solar system to the other side, only less than a year, but in the Milky way, at least 100000 years! In the vast universe, even if many stars are close together, they are not so bright

so, what is the power of the Milky way to attract such a huge space that all the celestial bodies revolve around it? We know that the reason why the sun can attract eight planets to rotate around it is because of its great mass; Therefore, in the center of the galaxy, there must be a star of great mass, attracting hundreds of millions of stars to orbit

in fact, this massive object is a black hole, which lives in the center of the Milky way, and all the objects in the Milky way are circling endlessly. But we must have a question: black holes can't emit light, so why is the core of the Milky way so bright

we must have seen a lot of pictures of the Milky way. In fact, the so-called Milky way is like a cloud, a dense cloud, not like the river in our life. So we have no doubt why the Milky way is flat? It is very complicated to explain this problem, involving a lot of theories and data. To put it simply, in the most primitive times, there were many galaxies in the Milky way. In fact, there were no rules. Each galaxy was a cloud of st and had no chaotic shape. But because of gravity, just like the familiar solar system, a regular structure was formed under the action of this gravity, We can think of him as the beginning of the galaxy. Because this system has a force, called angular momentum, which is conserved in the absence of external interference. The most basic phenomenon formed in this way is revolution. Almost all matter in the galaxy rotates in the same direction. From the whirlpool and other similar rotation in our life, we can know that under the action of this central force, a disk motion is formed, which also ensures that the materials on the disk will not collide disorderly in the process of motion

then we can very simply imagine that there will be chaos. After a long time, the consequence of such inelastic collision is to weaken the vertical force, so a flat plane is formed. At the same time, the whole mass is still in autobiographical motion, so there is a continuous formation of parallel structure, which graally forms the situation we see today. Most galaxies move on the same plane. In fact, this is also the reason why the solar system is flat. After all, these physical knowledge are the same in the universe, and the structure of these stars is also regular