Why does the sky appear dark (or black) to an astronaut instead of blue ?

We know that earth absorbs heat in day and radiates at night. When sky is covered, with clouds, the heat radiated by earth is reflected back and earth becomes warmer....

(a) The scattering away of red light makes the sky appear blue during the day time. False (b) The scattering away of blue light makes the sun appear red at sunset. True

Solution : Dark or black

The moon appears big in the sky though it is smaller than other heavenly bodies because it is nearest to the earth than other heavenly bodies

A red rose is seen in green light. It will appear.  4. black

4. Blue, Green and Red

(a) Blue + Green = Cyan  (b) Red + Blue + Green = White  (c) Red + Blue = Magenta  (d) Green + Red = Yellow

A piece of paper appears white in sunlight because it reflects light of all the colours. It would appear red when viewed in red light.

(i) (a) Atmospheric refraction (b) Scattering of light  (ii) (a) Dispersion  (b) Refraction  (c) Total internal reflection  (iii) (a) Atmospheric refraction  (b) Change in the density of the atmosphere due to temperature and other conditions.

Sunlight reaches the Earth's atmosphere and is scattered in all directions by the gases and particles in the air. Blue light is scattered more than the other colours because it...