Question

What will be the colour of the sky as seen from the earth if there were no atmosphere?(a) Black(b) Blue(c) Orange(d) Red

Answer 1

It would be black .
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Answer 2

It will be (a) black

Without the atmosphere there is nothing local to act as a (secondary) source of light, so there is no light and we conventionally call objects that emit (little or) no light "black". So the non-object that is "the sky" could be called "black".