This is a video talking about the weight of shadow or even light. He says that the light has a weight of about 0.000000001 pound, (half a billionth of a kilogram) and of course it is very little weight ignorable many places but not for huge distances for example in Chicago because of sun light it become 140kg heavier. And in long ways like when we want to send a spacecraft to mars it is needed to be regarded because it will causes our spacecraft to led to go away about thousands of kilometers. So that when light is one you weight a bit more, ignorable.
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