From Rayleigh Scattering to the physics of water’s light absorption and scattering, scientists explain the blueness of our sky and oceans.. The ocean is blue because water absorbs colors in the red part of the light spectrum. Like a filter, this leaves behind colors in the blue part of the light spectrum for us to see.
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The colors of the ocean and sky have long fascinated humans. While they may look similar in hue, the physics behind their blue appearance is quite different. Here we explore why the ocean appears blue while the sky also takes on a blue tint.. Why is the ocean blue? People have wondered this for hundreds of years. One idea is that it reflects the sky. And it does-on the surface. From the coast, it may appear a deep blue on a sunny day. Or gray when it’s stormy. Or even turn a brilliant pink during sunrise or sunset. But if we sink below the surface, the blue color remains. Here, the water isn’t reflecting the sky. The blue hue is.