The water appears blue because it is reflecting the sunlit atmosphere from the relative perspective of the surface of the Earth. (There are other reasons too.)
The Earth appears blue from outer space because of the reflection and scattering of sunlight off the oceans and atmosphere. The oceans absorb longer wavelengths of light while reflecting shorter blue wavelengths, and the atmosphere scatters blue light from the sun, resulting in the overall blue appearance.
The blueness you see on the Earth from space is the oceanic water.
It's the water, and the green is land.
Well to begin with, the blue you see in pictures from outer space are the oceans. The sky really isn't blue; it is the reflection of a certain wavelength of light (Blue) off of the particles in the air. So the atmosphere is essentally clear.
The water appears blue because it is reflecting the sunlit atmosphere from the relative perspective of the surface of the Earth. (There are other reasons too.)
Astronomy is the study of the outer space. If you look up at the sky at night you are looking at outer space which is astronomy.
An observatory
From outer space, Earth appears very smooth and round due to its spherical shape. The atmosphere and oceans create a layer of haze that gives the planet a soft, blue appearance. Overall, Earth looks serene and relatively featureless when viewed from afar.
Earth appears blue from space because of its oceans, which cover about 71% of its surface. This vast amount of water reflects and scatters sunlight, giving the planet its characteristic blue appearance. Additionally, the Earth's atmosphere also scatters sunlight, which further contributes to the blue hue when viewed from space.
1. Outer space contains virtually no gas/dust to scatter light. Outer space is black. 2. The sky is blue because that's the colour of air (mostly nitrogen), which is not totally colourless. You can see this effect looking at distant (10 km-plus) mountains. They have a blue tinge (caused by the intervening air between you and the mountains) known as atmospheric perspective. 3. If the sky's colour was due reflection from the oceans, then it would be white above Antarctica, which is snowy white. 4. If the ocean was blue because it reflects the sky, why does it still look blue-ish when under a totally clouded-over sky? The ocean is blue for the same reason the sky is blue: the sky is blue 'cause that's the colour of air, the sea is blue 'cause that's the colour of water.
Yes but no , the blue whale is blue & gray but they look a fine lite blue under the sea.
Because, seen from space, it's obvious that most of the Earth's surface is covered by water. If you look at the Pacific ocean from space - it almost covers the whole of the visible surface ! Have a look on Google Earth - you'll see what I mean.