... There is a type of giant yellow variable star called a Cepheid. ... to be identified, but the are many others, in fact familiar Polaris is a cepheid ... astronomer called Henrietta Leavitt realized something very special about cepheids ...
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Ссылки http://www.armaghplanet.com/pdf/AstroTopics/Measuring%20the%20Universe/cepheid.pdf -- 78.9 Кб -- 20.09.2011 Похожие документы
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... 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/AstroTopics/Measuring%20the%20Universe/hubble.pdf -- 134.1 Кб -- 20.09.2011 Похожие документы