... Cepheid, stars which pulse at a rate governed by their brightness, are extremely useful `standard candles' for astronomers, who can easily tell how far away a Cepheid is just by observing how long it takes to cycle from minimum to maximum brightness. ...
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Ссылки http://www.armaghplanet.com/pdf/Astronotes/Astronotes2006/Astronotes_Dec_2006.pdf -- 2337.1 Кб -- 20.09.2011 Похожие документы