Why does the Earth look blue from space?

Answer 1

It looks blue because 70% of its surface is covered by water.

The oceans (and lakes and large rivers) appear blue because of the way sunlight is selectively scattered as it goes through our atmosphere. It turns out that the SIZE of oxygen molecules and nitrogen molecules are almost the same and they are comparable in size to the wavelength of blue light. In simple terms, this makes it so waves of blue light effectively run into the oxygen and nitrogen molecules in the atmosphere and are then bounced off in all directions. Scientists call this scattering.

The wavelengths of red light are somewhat bigger, and they tend to be able to get past the oxygen and nitrogen molecules without being entirely blocked. This allows the red light part of sunlight to more easily pass through the atmosphere, while blue light doesn't get very far before being scattered.

When you're on the ground looking up at the sky, you are looking at an area where sunlight has already passed by (cross-ways to you). You see a good amount of scattered blue light and much less scattered red light. So the sky looks blue to you.

Answer 2

The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.

However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue.

Answer 3

That's because the majour part of earth contians only water..


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Answer 4

Because the earth is 75% water.

Answer 5

its because of water ,water is blue because of reflection of the sky and majority of earth is water

Answer 6

because the majority of the earth is water.

Answer 7

it's becuz of the atmosphere reflected by the sun it looks blue

Answer 8

because earth is mostly made up of water.

Answer 9

reflecting from the sky