Question

Assertion (A) : The sky looks black instead of blue in outer space.
Reason (R) : No atmosphere containing air in the outer space to scatter sunlight.

Answer 1

Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

• The sky appears black in outer space due to the absence of atmosphere. Outer Space is nearly a  vacuum without any media.
• Planet Earth possesses a thin layer of atmosphere containing several gas molecules and dust particles to scatter the sunlight into its constituent colours. The molecules in the air scatter blue light more than the red light from the sun due to the same wavelength of blue colour as that of the particles in the air. So the sky looks blue.
• Scattering is the phenomenon in which the light rays get deviated from their straight path after striking any obstacles in the atmosphere like suspended particles.
• In space or Moon, the light from the sun always travel in a straight line without any deviations or scattering and all the colours fits together and looking towards the sun it seems to be a whole white light but the opposite side is dark.