If the Earth had no atmosphere, there would be no scattering of sunlight, and as a result, the sky would look dark. Scattering, particularly of shorter wavelengths, is responsible for the blue color of the sky. Passengers flying at very high altitudes may observe a dark sky as scattering is not prominent at such heights.
What would happen if the Earth had no atmosphere, and how does the absence of scattering affect the appearance of the sky?
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If Earth had no atmosphere, there would be no air molecules or particles to scatter sunlight. Without scattering, the sky would appear completely dark, similar to the view of outer space. The absence of atmospheric scattering means that sunlight would travel directly from the Sun to the Earth without changing direction, leading to a lack of diffused light. Consequently, the phenomena like the blue color of the sky, the reddening of the sun during sunrise and sunset, and the visibility of sunbeams would be absent, resulting in a starkly different and darker visual experience on Earth.