When you go outside on a clear, moonless night, you can see not only lots of stars but also the black space between them—literally space, in this case. Given that you can see stars and that the sky is ...

Have you ever wondered why the night sky is dark? Doesn’t seem like much of a brainteaser, does it? Everyone knows the sky darkens at night because the sun sets … or more accurately, because our part ...

This striking satellite photo shows 10 swirling "dark voids" that appeared above an uninhabited volcanic island in the Indian Ocean. The black spots are the result of atmospheric cloud vortices, but ...

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