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Why is space black?

Why is space black?
Jack Hayward from Swansea (Age 5-14)

The sun is really big and bright but why is space black?
Dominic Simpson from Stockton on Tees (Aged 5-14)

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One Response

  1. Space appears black for 2 reasons. Firstly it doesn’t emit any radiation that our eyes can see. It does emit some radiaition at mircowave energes but our eyes can’t see that wavelength.

    Secondly, it doesn’t reflect much of the sun’s radiation at wavelengths that our eyes can detect. In fact space itself is a very good absorber(one of the best). There is a lot of empty space for the radiation to go into and only a very low density of atoms or small dust particles for the light to bounce off.

    All in all space is almost as black as one can get.

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