Multiple choice

An astronaut in outer space will observe sky as

  1. white

  2. black

  3. blue

  4. red
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In outer space, beyond Earth's atmosphere, the sky appears black because there is no atmosphere to scatter sunlight. On Earth, the sky appears blue due to Rayleigh scattering - molecules in our atmosphere scatter shorter blue wavelengths more than longer red wavelengths. Without this scattering effect in space's vacuum, darkness is all that's visible except for direct light sources like stars and the sun.

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