Measuring the Universe

Measuring the Universe

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For the past three decades the question qhow big is the universe?q has been one of the most hotly disputed topics of modern astrophysics and cosmology. Our uncertainty about the size and age of the observable universe is no more than a reflection of our uncertainty about the distances to nearby stars and galaxies. Distance determination is not only one of the most important tasks that astronomers face, it is also one of the most difficult. Measuring the Universe begins by describing methods of measuring distances on Earth, then climbs the various qrungs of the distance ladderq that takes us all the way to an estimation of the distances of the farthest known objects in the universe. In this introductory book Stephen Webb emphasises general physical principles rather than mathematical detail. There are lots of worked examples, and each chapter ends with a helpful summary of main points, questions and problems, and a guide to further reading.We can thus plot the HR diagram for a remote cluster. Since the clustera#39;s distance is unknown, such a diagram is a plot of apparent magnitude against spectral type . If we compare this diagram with the calibrated HR diagram for the Hyades weanbsp;...

Title:Measuring the Universe
Author: Stephen Webb
Publisher:Springer Science & Business Media - 1999-03-18

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