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Stories about: Hertzprung-Russel diagram

Milky Way Gets New 3D Map Our galaxy, the Milky Way, is of the massive spiral variety, which means that it features two arms (four by some accounts) filled with stars. Measuring the distance to these stars is something that may seem simple at first, but which is actually very complicated, mostly because of the inherent uncertainties that exis... 25 November 2009 09:59 GMT