Extreme Dieting

Alis Deason, an astronomer as the University of California, has discovered perhaps the most exteme diet result ever: the Milky Way Galaxy appears to have lost half its mass.

Weighing in at perhaps 1 trillion solar masses, the galaxy is still incredibly massive. However, this is much less than was previously estimated. The usual method is to find stars about halfway out from the core, measure their rotational speed around the core, estimate their mass, and use this to estimate the total mass of the galaxy.

The new method uses stars far out on the glalactic halo, which have widely varying veleocities depending on distance. In theory, this should produce a more accurate measurement of total mass. The results are surprising, but the method seems to be sound. We will have to wait for indep

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