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mercredi 7 août 2013

How Do We Measure the Distance to Stars?

The answer lies in the tiny shifts we see in a star’s position as the Earth revolves around the sun. Scientific American contributor Christopher Crockett explains.



21 hours ago

http://www.scientificamerican.com/video.cfm?id=how-do-we-measure-the-distance-to-s2013-08-06&utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ScientificAmerican-Global+%28Content%3A+Global%29

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