An astronaut in outer space will observe the sky as -

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White

Black

Blue

Red

answer is B.

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Detailed Solution

Concept- The absence of particles in the sky prevents light from scattering, which would cause the sky to seem black. When a parallel beam of light travels through a gas, some of it scatters, appearing in directions other than the one from whence it was incident. Light scattering is the technical term for this.
Light is absorbed by molecules and subsequently re-radiated in various directions, according to the fundamental principle underpinning light scattering. The least scattering colour is red, whereas the most scattering colour is violet. On Earth, the sky appears blue because of the atmosphere's role in dispersing sunlight. Scattered light reaches our eyes when we glance up at the sky. Since blue is the colour that scatters the most in sunlight and is therefore more prevalent, it seems blue. Light seems blue as a result.
In contrast, there is no light scattering in outer space. The astronaut will perceive the sky as being completely black since there are no particles in space, which prevents light from being scattered and reaching the astronaut.
Hence, option 2 is the correct answer.

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