May I ask a friend who is here for a more scientific question, what is outside the universe?

The universe is the sum total of all time, space, and matter in which we live.

Many current scientists believe that time has a starting point, originating from the big ** about 15 billion years ago. So before this universe, there is another universe. Scientists have not yet found a basis to say whether the current universe will shrink to a point again, and thus form a new universe again.

At present, many scientists believe that the universe we live in is made of matter. There should be a universe at the same time, made of antimatter. What is antimatter?

To put it simply, in the atoms of normal matter, protons are positively charged and electrons are negatively charged, while in antimatter atoms, protons are negatively charged and electrons are positively charged. The vast majority of physicists believe that antimatter exists, and have observed the collision of positrons and negatives. The question is whether antimatter is as much as positive matter and forms its own universe.

There are also some hypotheses, for example, some scientists believe that the fastest in our universe is the speed of light, and the speed of light is the upper limit of all motion. Instead, there should be another universe at the same time, where the slowest is the speed of light, and all movement is faster than the speed of light, so that the two universes cannot observe each other.

Human beings still know very little about the universe, and all conjectures are only conjectures until they are confirmed. If you're interested, take a look at Stephen Hawking's A Brief History of Time.

It is the general term for all space, time, and all matter in the present world. Now there are theories that the time and space of the universe are not infinite, and that the beginning of the universe originated from a single large**. Trillions of years later, the universe may undergo a great squeeze, and the space of the universe is also limited, from an infinitesimal point to the current 93 billion light-years.

The age of the universe is only 13 billion years, which is the result of the superluminal expansion of the universe. Someone once questioned that since the universe is expanding, it proves that there is "space" beyond the universe. So what's beyond the universe?

At the current level of human science, it is not yet possible to completely explain all the phenomena in the universe.

At present, there are three mainstream hypotheses outside the universe, which are: the multiverse hypothesis, the bounded unbounded hypothesis, and the infinite dimensional vacation theory.

The Multiverse Hypothesis.

The multiverse, also known as parallel universes, refers to the collection of existing universes that may have several, or infinitely different universes. These universes can be seen as parallel worlds, and in these parallel worlds, there may also be another self. The particles that make up the universe repeat themselves to a certain extent, thus creating an infinite number of universes.

The multiverse was Hugh by physicists. Everett III formally proposed that in quantum mechanics, there are multiple parallel worlds. The results of each experiment observing quantum mechanics are different, so different events occur in different parallel universes.

The borderless hypothesis.

This hypothesis holds that the existing universe is finite, but there is no hunger for definite boundaries. Just like the earth, although the size is limited, we will never go to the end. Because the earth is round, we will eventually return to square one.

The bounded unbounded hypothesis is similar to space-time jumping, when we reach the "edge" of the universe, we will eventually return to the original point due to the curvature effect of space-time.

Infinite Dimension Vacation said.

This hypothesis holds that our universe is a progressive relationship, for example, for bacteria on the human body, the human body is their "universe". It is difficult for them to exist independently of the human body, and the same is true for human beings, the universe is vast and boundless for us, but the universe may also be part of the body of some higher civilization, and so on.

These are the three hypotheses about the universe.

1.We haven't found any aliens yet, which is very good news. With the current technology of mankind, it is impossible for us to directly discover aliens, unless aliens come to us.

If they come to us, it means that their technology is far superior to ours, and we are afraid that we will become playthings in their hands.

2.Mars is one of the planets targeted for human migration, and it resembles Earth in many ways, but its gravitational pull is much worse. A person weighing 100 kilograms on Earth on Mars, only 38 kilograms.

3.Neptune is sometimes farther away than Pluto.

4.The temperature on the surface of the sun is 5,800 kilos, but some areas above the sun can reach 1 million degrees Celsius, and scientists have not yet been able to explain the cause of this phenomenon.

5.The sun also rotates, and its rotation period is about 25 days.

6.Neptune is the only planet that is impossible to see with the naked eye.

7.At the center of the Milky Way is a supermassive black hole with a mass 4 million times that of the Sun. And next to it, there is likely to be a medium-mass black hole lurking.

8.Neptune's orbital cycle is 165 years, and since its discovery in 1846, it did not complete its orbit until 2002.

9.The Great Andromeda Galaxy is approaching our Milky Way and will collide together in the future to form a larger elliptical galaxy. However, we don't have to worry about catastrophe in this catastrophe, because it will be at least 3 billion years from now, maybe even 8 billion years from now.

10.Mercury and Venus are the only planets in the solar system that do not have moons, and even Pluto does.

11.The Hubble Space Telescope is dedicated to American astronomer Edwin Hubble, who was the first person to discover extragalactic galaxies and a pioneer in bringing humanity to the idea that the universe is in a state of expansion.

12.All the news about flying saucers and aliens is fake, and the UFOs have basically been confirmed to be just real life phenomena.

13.The diameter of the Sun is 109 times that of the Earth and 1 109 of the distance between the Sun and the Earth, that is, the distance between the Sun and the Earth multiplied by the diameter of the Earth is exactly the square of the diameter of the Sun.

14.The diameter of the Sun is 400 times that of the Moon, and the distance between the Sun and the Earth is 400 times the distance between the Earth and the Moon. Therefore, two celestial bodies with vastly different volumes can see the same effect on Earth.

15.Our past perceptions of exoplanets are likely to be wrong, exoplanets are not uncommon and are likely to be the norm in the universe. Exoplanets with water are not unique and are likely to be very common.

The possibilities are endless. But here are some possible scenarios:

If you are able to travel through the observable universe, you have the potential to simply travel back to the universe you came from, just as light is bent back into a black hole.

There may be an obstacle edge, and beyond that barrier edge, there are completely different types of "spaces" with different physical properties.

There may be many universes, and perhaps there is one for every quantum possibility in our universe.

A "bubble" of the universe may exist, and each bubble in the bubble represents a different universe.

The uncharted realm is a temporary definition of the environment outside the universe by scientists, which may be dangerous or opportunity.

What exactly is outside the universe? In summary, there are only two answers. One is danger and the other is opportunity.

If, one day, there is really a war with the creatures outside the universe, we want to win the warThe development of science and technology must be advanced enough。After all, in this era, the development of science and technology is the mainstay, and only with strong combat effectiveness and scientific and technological strength can war become more comfortable.

Scientists' definition of the outside of the universe is actually a multi-dimensional world, and it is very likely that there is another universe outside the universe.

The broad definition is that the universe has no distinction between inside and outside, that is, it is a whole, and in a narrow sense, "cosmic microwave background radiation" means that the universe we see in this background cannot be observed in the background we cannot see, and it is still unknown.

Scientists define the outside of the universe as space, and scientists believe that there is a larger space outside the universe, and there are many solar systems in this space.

For example, Albert Einstein proposed that there is boundary, he believed that the universe we exist in is multidimensional, and for those creatures living in the four-dimensional space, the universe that exists may be a multi-dimensional space, and these spaces are intertwined with each other, so we can't find the boundary between the universe and the universe.