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	Verhandeling over het verschijnsel van exploderende sterren welke veel invloed hebben op het ontstaan van materie in het heelal&lt;/p&gt;
&lt;span style="font-size:10pt;"&gt;Wat zijn nova's, om maar niet te spreken van gigantische bewegende zonnen, de Supernova's? &lt;/span&gt;&lt;span style="font-size:10pt;"&gt;Sinds het ontstaan van onze Melkweg, zo'n 15 biljoen jaar geleden hebben er ongeveer 280 miljoen Supernova-explosie's in het heelal plaatsgevonden. Slechts 80.000 Supernova's moeten op aarde zichtbaar zijn geweest, de rest bleef verborgen achter wolken van interstellair stof. &lt;/span&gt;
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	Light observed from distant objects is found to be deflected by the gravitational field of massive objects near the line of sight - an effect predicted by Einstein in his first paper setting forth the general theory of relativity, and confirmed by Eddington soon afterwards. If the source of the light is sufficiently distant and bright, and if the intervening object is massive enough and near enough to the line of sight, the gravitational field acts like a lens, focusing the light and producing one or more bright images of the source. This book, by renowned researchers in the field, begins by discussing the basic physics behind gravitational lenses: the optics of curved space-time. It then derives the appropriate equations for predicting the properties of these lenses. In addition, it presents up-to-date observational evidence for gravitational lenses and describes the particular properties of the observed cases. The authors also discuss applications of the results to problems in cosmology&lt;/div&gt;
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Getting the Measure of the Stars bridges the gap between dedicated amateurs and fully fledged professionals, both who seek to understand the nature and evolution of the stars. In terms accessible to the layperson, the first part explains how and why some stars have varying brightness, and what this variation can tell us about their physics and structure. The authors go on to discuss how to make brightness measurements, either by the unaided eye or by using photoelectric photometers. The book also discusses the accuracies of various methods and the limitations on projects. The final section describes possible projects, the observations required, and what these would do to enhance our understanding of the stars and the solar system. Incorporating a great deal of theoretical and observational expertise, this book is a vital source of reference for those wishing to maximize their enjoyment from the use of small telescopes.</text>
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