Where does the blue color of the earth come from?

According to the spacecraft photographed from space of the Earth** and astronauts in space to see the Earth with their own eyes. It's a blue star. Why is the earth blue?

In terms of the size of the Earth's oceans and land, the Earth's surface area is 5.1 billion square kilometers, and the oceans account for 71 , which is equivalent to 2.5 times the land area. Although the Northern Hemisphere has 2 3 of the world's land area, its land area accounts for only 39 3 of the total area of the Northern Hemisphere itself, and the remaining 60 7 places are oceans. The oceans in the Southern, Eastern and Western Hemispheres are also larger than land.

If we change the angle, take the intersection of the 0° meridian and the 47° north latitude and the intersection of the 180° meridian and the 47° south latitude as the two poles, and divide the earth into the water hemisphere dominated by water and the land hemisphere dominated by land. This suggests that in any part of the planet the ocean is the main body. The average depth of the Earth's oceans is nearly 4,000 meters, and the water volume of the Earth's oceans is 13,380 million cubic meters, accounting for 96,500 of the total volume of the Earth's hydrosphere.

Unlike land, the ocean is a continuum of wholes. The oceans communicate with each other to form a unified world ocean, making the land appear as if it were floating on the ocean.

Because the ocean is vast and continuous, and the water is blue, when you look at the earth from space, it becomes a beautiful blue star.

Water reflects blue band to visible light and absorbs light at other wavelengths, so seawater appears blue.

The vast majority of the Earth's surface is covered by seawater, and the impression of the Earth being almost entirely blue when viewed from space is the same.

My answer and theirs are different, because water vapour scatters a lot of blue-violet light with short wavelengths in solar radiation. Causing the sky to be blue ... And there is more water vapor on the surface of the ocean, and a large area of the earth is the ocean, so the earth is blue when you look at it from the outside world...

Water, which accounts for 71% of the Earth's area, is emitted blue when illuminated by sunlight. However, you may not be able to see the place where the sun does not shine, but now humans cannot reach that place.

The color of the sea, the sea absorbs a lot of ultraviolet rays, so the sea is mostly blue.

The surface of the earth is mainly covered by the ocean, which accounts for about 70% of the earth's area, and there are many algae in the ocean, and some algae can appear blue under the irradiation of light, so the earth is a blue planet in the universe.

This is because blue light, which has a longer wavelength in the visible light of the sun, is most easily scattered by molecules in the air, so the sky is blue, and because most of the earth is an ocean, the ocean is also blue.

Looking at the sea in the universe is like looking at the sky on the earth, it is blue, and the reason is the same.

That's when the blue in the sunlight is separated.

What you see is the color of the ocean.

1. Because the earth's surface area is 100 million square kilometers, of which 71 percent is oceans and 29 percent is land, the earth is blue when viewed from space.

2. The visible spectrum of the human eye ranges from red to purple from long to short, and the moisture in the ocean will attract light with longer wavelengths, so the shorter the wavelength, the easier it is to be scattered into space. And because violet light is absorbed by the atmosphere, you see more blue light.

Many friends are space fans, always like to read some ** and books about the universe and the earth, many friends will find that looking at the earth from space, the earth is blue. Many of the ** about the appearance of the earth on the Internet are also cerulean blue. Why is that?

The composition of the planetFriends who have studied geography know that there are seven continents and eight oceans. The earth is made up of land and sea. Moreover, the volume of the earth is very large, and the proportion of human volume on the earth is very small.

We can't see humans in outer space because humans are so small. In space, we can only see some parts of the land and parts of the ocean. It is for this reason that the Earth looks blue in outer space.

Because the proportion of water in the surface area of the earth, that is, the area of the ocean, is very large. The color of the ocean is dark blue. As a result, the color of the Earth when we see it in space will turn blue.

The principle of optics <>

The earth's surface contains a variety of gases, including oxygen and carbon dioxide. There is also an ozone layer on the outside. When our eyes see colors through light, these colors are irradiated by the light, and due to the different gas compositions, the color information carried by the light through the various gases will also be biased.

So the color of the ocean, which we usually see with the naked eye, is dark blue. The color of the ocean seen in outer space is azure. This is because the reflection of light through a variety of gases causes some subtle changes in color.

When it is refracted into outer space, it becomes blue. But the overall will not deviate too much. In summary, these are some answers to the question of why the color of the Earth is azure when viewed from space.

Do you all understand? Do you know any secrets about Earth and space?

Because the atmosphere scatters sunlight, about 70% of the Earth's oceans are the color of the ocean.

Because of the refraction of light, it makes people look like the earth is blue, but the earth is not that color.

This is because many parts of the earth are oceans, so when you look at the earth from space, it looks like an azure color.

It's the color of the oceans on the earth, and the color of the oceans is blue, so it's the color that comes in.