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Anonymous users2024-02-13There is only three-dimensional space, the so-called four-dimensional space, which is just a way of saying that time is added to it, called four-dimensional space, which has not yet been recognized by the physics community.
Dark matter was discovered decades ago when an Australian female astronomer observed extragalactic galaxies and found that the extragalactic galaxies were clustered in a way that did not conform to the theory of relativity and gravitational (i.e., their own mass was not large enough for them to be so congregated).
Therefore, in order to explain this non-relativity phenomenon with the theory of relativity, scientists hypothesized that there is a substance in the universe that cannot be observed by humans but has mass, which is delicately surrounded by all galaxies (dark matter halo) by unknown means, and has an effect on the gravitational attraction between galaxies--- but be careful.
1 Dark matter has nothing to do with black holes because black holes are inside galaxies, and the mass of black holes is part of the mass of galaxies.
2 Dark matter has nothing to do with neutrinos, whether neutrinos have mass or not, because neutrinos are evenly distributed across the universe and cannot surround galaxies without interfering with the movement of the galaxies themselves.
3 There is no dark matter in the solar system and the Milky Way, because the orbits of the celestial bodies in the solar system and the Milky Way are completely in line with gravitational force and the theory of relativity.
That is, dark matter is a substance that cannot be observed, and its only reaction is that it has mass, which can cause a depression in space (gravity).
The one below said that the one who supports the expansion of the universe is dark energy, which has nothing to do with dark matter.
The ultimate speed of the universe is the speed of light, which is undoubtedly at the heart of the theory of relativity. So far, no one has been able to oppose the theory of relativity, no one has been able to shake its position--- not even Einstein himself.
Experiments, including the European Particle Collider, have tried to accelerate particles close to the speed of light, but no matter how much energy is increased**, the accelerated particles will not be able to break through the speed of light.
Therefore, in this universe, the speed of light is the ultimate speed and cannot be exceeded. In order for humans to achieve space flight, they need other ways to bypass the speed of light, such as jumps, wormholes, distorted space, and so on.
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Anonymous users2024-02-12Does Four-Dimensional Space Really Exist? What exactly is a four-dimensional space? I couldn't believe it after reading it.
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Anonymous users2024-02-11The speed of light limit is a conclusion reached in the theory of relativity, but the theory of relativity is also deduced from two assumptions, which has not been proven, but is accurate at the moment, so we think it is right. The theory of relativity also states that mass increases with velocity, so acceleration becomes smaller and smaller, resulting in a constant failure to reach the speed of light. We haven't found anything faster than the speed of light so far, but we can't prove that there isn't.
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Anonymous users2024-02-10The difference between three-dimensional space and four-dimensional space is that time in three-dimensional space is irreversible, while time in four-dimensional space is reversible.
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Anonymous users2024-02-09The four-dimensional space is the space we live in now, which is composed of three-dimensional space and a time axis.
Dark matter is the matter that makes up the universe and supports its continued expansion, accounting for 98% of the total matter in the universe
The ultimate velocity of the universe is not the speed of light, and the rotation speed of a black hole is close to the ultimate velocity of the universe.
The Panstad Staircase is a geometric paradox, in a staircase that goes all the way up or all the way down, you can't find the highest point and the lowest point, you can't find the end of the staircase, you can't go down the stairs again, because it's a circular staircase that connects to each other. >>>More
I don't think so. You see, if you reach that speed and fly towards the stars, the first thing you see is 200 years ago, an hour later it will be 180 years ago, and two hours later it will be 150 years ago (just make an assumption, I don't count). Because you are getting closer and closer to the stars, it doesn't mean that you have walked into it, but the light you see is still 200 years ago; The reason why you see the light 200 years ago is because you are 200 light-years away from it, and if you are 100 light-years away from it, you will see the stars from 100 years ago (and the light does not follow you). >>>More
The landlord may have misunderstood, let me tell the landlord, I am the most proficient in my side. >>>More
Yes, the universe is four-dimensional, but three dimensions are space and the other is time. Therefore, it cannot be said that "the universe is a four-dimensional space". >>>More
Four-dimensional space-time. There are various multidimensional spaces in mathematics, but so far, the physical world we know is only four-dimensional, that is, three-dimensional space plus one-dimensional time. The high-dimensional space mentioned in modern microscopic physics is another meaning, which has only mathematical significance. >>>More