Based on what you have learned, talk about why the universe is vast

Thought is based on the tangible world, (explain, what is left of our mind other than what we hear, see, feel, smell and taste?) The universe constitutes our existing tangible world, so the mind cannot transcend the universe. The universe increases or decreases according to the desires of thought, for example, in the past, scientists used molecules as the elementary particles of matter, and matter was made up of molecules.

So what is the molecule made of, and then it was discovered that the atom, then the proton neutron, and now the quark, and then the upper and lower quarks, and then the upper and lower quarks, and will continue to be divided in the future, just like pi, you don't want to be in addition to it, but if you want to get to the bottom of it, as long as time exists, you can keep dividing. Understand that the universe can be as small as infinite, not to mention large, just like a straight line in geometric mathematics, now it is known that one end of it can be infinitely extended, although we don't know its other end, but we can say for sure that this straight line is infinitely long. As long as you want the universe to go on forever, you can go on in a spaceship until the end of time.

If there is no time, there is no thinking, everything is meaningless, and you can continue to walk when the cosmic time wave arrives, but human consciousness cannot perceive the time to stop, and the time that human beings feel is always coherent (maybe I type this time and time will stop a few times, who knows), once you reach the boundary of the universe, that is, the boundary of time, you can only stop in the boundary and wait for the arrival of the time wave (the earth may have passed tens of thousands of years), your own feeling has been walking and has never stopped, Therefore, human beings will never be able to penetrate the universe, and if the universe expands to **, you can only go to **, but you will never feel the existence of the boundary, giving people the feeling that it is infinite. (This leads to a funny theory: giving a speed chase time wave can slow down time to travel to the future, but instead of going back in time, it's a one-way irreversible time travel.)

In the mythical world, one day in the sky and ten years in the earth may be realized).

There are about more than 100 billion galaxies in the universe, but the Milky Way is just one of them. There are about 100 billion stars in the Milky Way galaxy alone, and the Sun as we are usually familiar with it is just one of the ordinary stars.

The universe is so vast that the distance between celestial bodies must be calculated in light years. But one light-year is equivalent to all the distances traveled by light in a year, about 10 trillion kilometers. Just in terms of the solar system to which our Earth belongs, the distance between its two sides is about 12 billion kilometers.

If we were to travel to the Milky Way in a rocket that is as fast as the speed of light, it would take at least 10,000 years to reach the center of the Milky Way (the diameter of the Milky Way is 100,000 light-years). If you travel in space on a light-speed rocket, it will take at least about four years to reach the closest star to the Sun: Proxima Centauri.

Proxima Centauri is light-years away from Earth, about 40,678 billion kilometers. If we continue to move at the same speed, it will take 160,000 years to reach another galaxy.

What I learned told me that the universe is edged, and that the diameter of the universe is about 5 billion light-years. The world outside the universe is not called the universe because it has no effect on everything in the universe that we are now.

The universe is boundless because it is a thing without boundaries, in the universe, time is space, time is infinite, and space is infinite. Check out "A Brief History of Time" or, "The Big Design". It's all written by Stephen Hawking.

The universe cannot have edges, and if the universe has edges, then what is beyond the edges of the universe is not the universe. So the universe is immense.

There is a limit to everything, the so-called boundless, but with the current ability to measure and observe, it cannot reach the limit.

So people often say that an unknown series is infinite, boundless, infinite and wants to approach a certain number.

You can take a look at this comparison chart in bai: du

The sun is very big for us humans.

The dao is up, but the sun is just back a very popular.

There are hundreds of billions of stars in the Milky Way galaxy that are much larger than the Sun or the Sun. And billions of extragalactic galaxies as large as the Milky Way have been discovered. In this way, you can imagine how small the earth is in the universe!

Comparison, because that's what the teacher sends us to practice.