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lunes, 21 de septiembre de 2009

The Andromeda galaxy

September 16, 2009--The Andromeda galaxy shines in shades of purple and blue in the highest-resolution ultraviolet picture yet taken of our closest galactic neighbor.

The composite image, created using NASA's Swift satellite, reveals a striking contrast between the galaxy's smooth central bulge--which is full of older, cooler stars--and the clusters of hot, young stars scattered across its spiral arms.

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