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You know the old Hughes Mearns poem, "As I was going up the stair, I met a man who wasn't there ..."Astronomers study objects we assume are really there. But sometimes they're not. A few months ago we mentioned rainbows, which stirred some controversy. Are they there? Sort of. A rainbow is nothing but a group of light rays converging on your eyes. It has no solidity. It cannot cast a shadow. But i...
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February 2009: Surrounded by a shell of potassium gas, this red supergiant could explode soon. By
Bob Berman //
Published: December 29, 2008 |
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