OLBERS' PARADOX

• Have you wondered why the sky is dark at night? If you think that it is simply because there is no sunlight, you are in for a surprise. This bit of observational cosmology, which you can certainly verify in your own backyard, is due mostly to the fact that the universe is young.

  Click here and go to Item 8 for a discussion and references (you can use the Find In Current... button in the File menu, if you are using Mosaic, and type Item 8 in the pop-up window). There are many, well discussed questions about physics in this Physics FAQ, of which the previous one is a part of.

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  Fun with color and vision. This is adapted from the online exhibits of the San Francisco Science Exploratorium.