Question

what is scattering of light why is the colour of sky is obsreved by austronauts . why is the danger signal is red in colour ​

Answer 1

Scattering of light means the spreading of light according to distance travelled by it and the collision with particles which scatter the light.
Danger signal is red in colour as frequency of red light is less than other light and can observed in unfavorable conditions. Also it can be observed from far distances clearly.