Liu Yang: Black, even a vast abyss cannot be described! Why does outer space look black?

Tech 2023-09-19 15:06:08 Source: Network

The surroundings are particularly dark, the darkness that cannot be seen to the bottom, even the abyss cannot be describedThis sentence was spoken by astronaut Liu Yang in an interview with CCTV's "Face to Face" program at the beginning of this year. In fact, similar words are not the first time they have been spoken by Chinese astronauts, and Zhai Zhigang has previously described similar activities outside the spacecraft

The surroundings are particularly dark, the darkness that cannot be seen to the bottom, even the abyss cannot be described

This sentence was spoken by astronaut Liu Yang in an interview with CCTV's "Face to Face" program at the beginning of this year. In fact, similar words are not the first time they have been spoken by Chinese astronauts, and Zhai Zhigang has previously described similar activities outside the spacecraft.

So the question arises: the light of the sun can shine on the entire solar system, why is the space felt on the space station as dark and bottomless? Why can't the sun provide enough brightness?

Before continuing with the topic, let's dispel the rumor that astronauts can see stars on the space station, unlike many photos and images set in space that we see without any bright spots and are pitch black.

Of course, those photos or images are real, but a black background is only a problem with the shooting equipment, and the pilot can see the stars.

However, the astronaut's feeling was indeed a dark and bottomless darkness all around, among whichOne reason is that space is an open environment close to a vacuum, where light cannot be scattered or reflected and enter the eyes. Our eyes only know when it is shining when they absorb the light source.

It may sound a bit awkward to read, but it's easy to understand with a simple example. When we turn on a flashlight in a dark room, how do we determine if it's on?

This should be very simple, there are two points that can be easily determined: one is that there will be light spots on the wall, and the other is that the dust in the beam path will also be illuminated.

Now, what happens if we remove all the dust and particles? It may be a bit different, but because there is a spot of light on the wall, we can still clearly know that the flashlight is turned on.

So if the walls are also removed, can you still tell if the flashlight is turned on? The answer is no, if you want to know if the flashlight is on, the only way is to take a look at the real light source.

This is the environment in space, where there is not enough dust and particles to provide reflection and scattering of light, and it is too spacious to imagine, so there are not enough objects there to provide reflection for light.

So, we only know when our eyes are facing the light source that it is emitting light.

On the other hand, you may have noticed that there is another way to determine whether a flashlight is lit when turned on, which is that the entire room will become lit due to this light source.

In fact, this is also the result of light reflection and scattering. Through reflection and scattering, light can enter our eyes from all directions. During the day on Earth, it is everywhere bright, just like this, except that the light source becomes the sun.

When there is no reflection or scattering, the result is naturally a darkness, because if we don't look at the light source, the light cannot reach our eyes, which is why the sun is so bright and the entire space is dark.

The reflection of light by objects and the scattering of light by particles are familiar to us, so we can determine the distance. The blue color of the sky is the result of light scattering, and it also provides us with a visual sense of reaching the top.

However, when the light is not reflected or scattered,When we look up, we see the sky without a top, and when we look down, we see the abyss without a bottomUnless it is an object that sees the light source or reflects the light source.

Deep space phobia.

This is actuallyOlbers paradox.

The universe is constantly expanding, and for distant stars, their relative expansion speed can exceed the speed of light, which will never enter our eyes;

137137.

930.

#Everything we see and get is very scientific#

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