Why is space pitch black and not any other color?

Why is the universe black and not the other color? It took scientists more than 100 years to find out.

Because the universe is vacuum. Other colors are formed by the refraction of light in the air, and there is no air in the universe, so they are black.

Because there is basically no air in space, it is impossible to refract starlight. Therefore, it appears black, that is, colorless.

Because light is scattered through any structure with coarse particles, and there is nothing in space to block the light, this causes space to be dark because space neither reflects any light nor scatters any light.

In the universe, there is another kind of light, the light radiated by the universe 13.7 billion years ago, these lights have long been transformed into microwaves that cannot be observed by the human naked eye after 13.7 billion years of space expansion, if we use a telescope that can see microwaves to observe the night sky, we will find that the night sky is actually bright, but we can't see it with the naked eye.

In addition, there is another theory, we all know that it takes time for light to travel, for example, the sun we see is the sun 8 minutes ago, and the universe is only 13.7 billion years old, which means that the farthest light we can see is emitted by a star 13.7 billion light-years away.

But this is just a theory, because the universe is constantly expanding, and its expansion rate has exceeded the speed of light, so the light emitted by the stars other than the 13.7 billion light-years we are talking about will always be on the road, and we will never see it.

There are seven colors in sunlight: red, orange, yellow, green, blue, indigo, and violet. Red light is the strongest, orange, yellow, and green are also stronger, and the weakest are blue, yellow, and violet.

When the sunlight penetrates the thick atmosphere, the red light runs the fastest and passes through it at once; followed by orange, yellow, and green lights; Most of the blue and indigo light are detained by the atmosphere, and they are pushed around by the dust and water droplets in the atmosphere, and they are reflected back and forth, resulting in the atmosphere being "dyed" blue. The sky is blue from the ground, but if you look out at the sky from an airplane, the sky is even bluer. If you take a spaceship to a higher place to look at the sky, then the sky is not blue, but purple, because of the weakest violet light, most of them can't even enter the first door of the atmosphere. The sky is colorless, but due to the refraction of sunlight, it has color.

And that's why the sky looks dark at night. At night, the sun does not shine on this half of the earth's sky, and without strong sunlight, the sky has no color, and some, it is only black. Of course, there is also the light of the moon and the stars, but the moon does not shine, the light of the moon reflects the sun's light, of course, it is not bright, and the stars are too far away from us, so the night sky we see will not be as bright as the day.

The images we see are mostly dark, but that doesn't mean there's no light passing through space.

The reason why the sunlight on the earth is so dazzling is because there are all kinds of air molecules in the earth's atmosphere that reflect sunlight everywhere, because there are a lot of dust powders on the earth that can scatter, refract and diffract sunlight, just like a small mirror, that is, every substance in the atmosphere emits light in all directions, so even if it is cloudy during the day, it is also bright.

In the same way, the universe itself is empty, and the dust and powder in space are "sucked" away by gravitational objects. There is almost nothing that can reflect light into our eyes, and a vacuum cannot refract light, so the space we see is dark – even around the sun is pitch black. In space, unless you look directly at the sun, you can't see the sun, so it's dark.

In fact, there is no atmosphere in space to resist the sun, and it should be more hot and intense, just look at the helmets of those astronauts who have blackout masks. In addition, Rayleigh scattering occurs when the radius of particles in the air is far away or smaller than the wavelength of the incident light, and the scattering intensity is inversely proportional to the fourth power of the wavelength of the light. Since blue light with a shorter wavelength is more likely to be scattered, we see that the sky is blue.

The Earth is also blue when viewed from space.

Summary. The reason why the sky is blue is because the molecules that make up the atmosphere scatter the shorter wavelengths of the sun's visible light, such as blue light and violet light, in all directions, including our eyes. However, in the absence of these substances, light is emitted from its source and travels in a straight line until it is received.

Since space is almost vacuum, this means that these particles are almost non-existent in space, and there is nothing between stars and planets that can disperse light and bring it into our eyes. Since no light enters our eyes, what our eyes see is naturally a black hole.

Why is it that a spaceship is flying in space, and it is pitch black during the day?

Okay, dear, the question has been received, please wait a minute.

The reason why the sky is blue is because the molecules that make up the atmosphere scatter the shorter wavelengths of the sun's visible light, such as blue light and violet light, in all directions, including our eyes. However, in the absence of these substances, light is emitted from its source and travels in a straight line until it is received. Since space is almost vacuum, this means that these particles are almost non-existent in space, and there is nothing between stars and planets that can disperse light and bring it into our eyes.

Since no light enters our eyes, what our eyes see is naturally a black hole.

Is there air in the spaceship.

What is the difference between planets and stars?

There is no air in space.

The biggest difference between a planet and a star is the relationship between the two, the star is the central object in the star system, and all the planets in its system are affected by the gravitational pull of the star and orbit the star. In addition, planets refer to celestial bodies that do not emit light, while stars are spherical light-emitting plasmas held together by gravity that emit light on their own.

What do astronauts rely on to breathe?

Astronauts mainly rely on the space station to breathe in space, and the air of the space station is generally divided into two types, one is the air from the earth, and the other is the space station's own production. The ISS has a well-developed system of oxygen replenishment and air filtration, all of which are configured according to the composition of the air on Earth.

Because in these **, there is no sunlight, and the entire universe is pitch black, so the background of the space earth is pitch black.

When shooting, there was no way to get to the earth in space, so it looked very dark.

Because the universe itself is pitch black, and the sun's rays do not shine.

In the universe, there is another kind of light, the light radiated by the universe 13.7 billion years ago, these lights have long been transformed into microwaves that cannot be observed by the human naked eye after 13.7 billion years of space expansion, if we use a telescope that can see microwaves to observe the night sky, we will find that the night sky is actually bright, but we can't see it with the naked eye.

In addition, there is another theory, we all know that it takes time for light to travel, for example, the sun we see is the sun 8 minutes ago, and the universe is only 13.7 billion years old, which means that the farthest light we can see is emitted by a star 13.7 billion light-years away.

But this is just a theory, because the universe is constantly expanding, and its expansion rate has exceeded the speed of light, so the light emitted by what we call stars 13.7 billion light-years away will always be on the road, and we will never see it.

There is almost no air in space, so all kinds of star light cannot be reflected, and space zhi will show its true color—black spot color.

Black is a relative genus.

The concept that without any color, the object is presented as black. Compared to other colors, black is not really a color, but a ground state. If an object is not reflective, then it is black.

If he can absorb all the light, then he is pure black. So, space doesn't reflect light into your eyes, so the space you see is black.

Because human glasses do not emit light on their own, they can only see things by receiving light reflected or emitted by other objects, and there is no such medium in space to reflect light! So what we see in space is black.

What we see is usually light that hits it and then diffuses it to our eyes, whereas space is a vacuum, and there's no dust particles like that, so the light there's usually a straight line and it's hard to reach our eyes, so it looks like space is black.

Perhaps we can understand this problem through many simple physical phenomena. For example, if there is no light coming into a room, and there is nothing in the room that can glow, then the room must be dark. If there is a weak light source in one corner of the room, such as a very dim lamp, the light is not bright enough to illuminate the rest of the room.

There is a distance between the corners of the room, just as there is a distance between celestial bodies in cosmic space. The energy of the light is constantly attenuated over a long journey. Luminescent celestial bodies, on the other hand, are farther away from us except the Sun.

This may be one of the reasons why space is black. Our eyes perceive light because it hits or is reflected directly onto photoreceptors. Since space is almost a vacuum, sunlight is hardly reflected to Earth.

Other stars are farther away from us. So we see space with a black background. Since we do not yet fully understand the material forms and physical phenomena of the universe, there may also be other factors that work together to form the black space.

Space is colorless and transparent.

There is no light, so it looks dark.