Multiple choice

To an astronaut in a spacecraft, the sky appears to be

  1. blue

  2. white

  3. dark

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

The sky appears dark to astronauts because space is essentially a vacuum with very few particles to scatter sunlight. On Earth, the sky appears blue due to Rayleigh scattering of sunlight by atmospheric molecules. Without an atmosphere, there is no scattering, so space looks black even when the sun is shining.

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