Saturday, October 10, 2009

How can we measure Galaxy distances?

Cosmology: Dark is the new black in Nature.
Rival experimental methods to determine the Universe's expansion are contending to become the fashionable face of cosmology. Fresh theoretical calculations make one of them the hot tip for next season.

It's difficult to determine distances in astronomy. Distances to galaxies have been measured using three techniques: Type 1a supernova; gravitational lensing; baryon acoustic oscillations - sound waves from the big bang.

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