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What other interesting things do you know about space?

1, the distance between various structures in the universe is so far that the proportional relationship becomes irrelevant. If we draw them on paper according to the real spatial distance ratio, they will be too small to be seen.

Therefore, all the photos we have seen that put the eight planets in the solar system into the same frame are not created according to the correct distance ratio. In the real dimension, even if we just draw a solar system with eight planets on a piece of paper according to the real distance ratio, we can't find the earth on the paper.

The moon revolves around the earth, the earth revolves around the sun, and the sun revolves around the center of the Milky Way.

3. The outward expansion of space itself exceeds the speed of light, which has already begun to happen.

4. Most of the space in atoms is "vacuum". If you imagine an atom as a football field, the nucleus is the same size as a tennis ball, while electrons float on the edge of the football field. If you don't leave a little extra space for the basic particles in the human body, then all mankind can cram them into a crystal box the size of a cube of sugar.

5. Quantum entanglement is a phenomenon that can transmit information on a large scale in a short time (even faster than the speed of light). But we can't use it to transmit information at present.

6. The gap between stars in a galaxy is very large. It is so big that when the Milky Way and Andromeda galaxies collide and blend after 4 billion years, there will hardly be any accidents of star collision, and you need to be reminded that each galaxy contains billions of stars.

Space environment:

Since BIGBANG, with the expansion of the universe, the temperature has been decreasing. At present, space has become an extremely cold environment with an average temperature of -270.3℃.

In space, various celestial bodies also radiate electromagnetic waves, and many celestial bodies also radiate high-energy particles to form cosmic rays. For example, the sun has solar electromagnetic radiation, solar cosmic ray radiation and solar wind. Solar cosmic rays radiation is the high-energy particles emitted by the sun when a flare occurs, and the solar wind is the high-energy plasma stream blown out by the corona.

Many celestial bodies have magnetic fields, which capture the above high-energy charged particles and form radiation belts with strong radiation. For example, there are two radiation belts above the earth. It can be seen that space is still a strong radiation environment.

Space is still a high vacuum and microgravity environment. Gravity is only 1% to1100000 g(g- acceleration of gravity), while the gravity felt by people on the ground is1g.