Why does the sky appear dark instead of blue to an astronaut?

AcademicPhysicsNCERTClass 10

The reason the sky appears blue:

When sunlight hits the earth's atmosphere then it is scattered in all directions through the air, gases, and small particles. Due to its shorter wavelength, blue light rays reach our eye first. So the sky appears to be blue.

The sky appears dark instead of blue to an astronaut:

    The following are the reasons why the sky appears black instead of blue to an astronaut:
  • The atmosphere is not found in space.
  • Due to the absence of an atmosphere, there is no scattering of light in outer space.
  • The atmospheric medium is very rarer so the scattering of light taking place is very low.
  • Therefore, without scattering, sunlight travels in a straight line like a beam of light in space.
  • It keeps the space dark because the sunlight is not scattered.
  • The sky appears dark to passengers flying at very high altitudes mainly astronauts.

Updated on 10-Oct-2022 13:22:12