Measuring distances in astronomy is notoriously difficult. Indeed, a quick glance at the nights sky reveals only a two-dimensional image, with no depth information. Yet, knowledge of precise distances is crucial, since thats the only way to determine the true, intrinsic luminosity of an object, from the apparent one, measured by our telescopes. The determination of distances therefore constitutes a major component of almost every astronomical study, whether that involves the evolution of stars or the accelerating expansion of the universe. huffingtonpost/mario-livio/an-astronomers-guide-to-t_b_5914768.html?utm_hp_ref=science&ir=Science
Posted on: Wed, 01 Oct 2014 20:57:09 +0000
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