Tuesday, March 30, 2004

Nebula, Supergiant nebulae

The most energetic diffuse nebulae in the Galaxy are revealed only by radio telescope - they are so heavily obscured by dust that they are inconspicuous optically. These nebulae have over 100 times more ionizations per second than does the Orion Nebula, too many to be provided by a single star (unless there are stars more luminous than any known within the Galaxy). Indeed,

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