New PDF release: A to Z of Scientists in Space and Astronomy. Notable

By Deborah Todd

ISBN-10: 0816046395

ISBN-13: 9780816046393

Designed for top university via early students, A to Z of Scientists in house and Astronomy is a perfect connection with impressive female and male scientists within the box of area and astronomy, from antiquity to the current. Containing greater than a hundred and sixty entries and 50 black-and-white pictures, the authors emphasize the scientists' contributions to the sector in addition to his or her impact on scientists who've undefined. The e-book is geared up with a basic advent that explains who's within the booklet and why; an inventory of entries; the entries themselves; indexes by way of box of specialization, nationality, topic sector, and chronology; a bibliography; and an index.

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Additional resources for A to Z of Scientists in Space and Astronomy. Notable Scientists [biographies]

Sample text

The matter of light waves was one that stayed with Arago throughout his lifetime. In 1838 he worked on the theory of an experiment involving the comparison of the speed of light through air versus water versus glass, but there were problems actually conducting the experiment. In 1850 experimentation could finally begin, but Arago’s age and failing eyesight meant that his colleagues Léon Foucault and Hippolyte Fizeau would have to carry out the work. Based on his specifications, the two proved his theory of light, in which the velocity of light decreases as it passes through a denser medium.

In 1905 Arrhenius retired from his professorship in physics and accepted a position as the director of the newly created Nobel Institute of Physical Chemistry in Stockholm—a position expressly tailored by the Swedish Academy of Sciences to accommodate his wide-ranging technical interests. That same year, he married his second wife, Maria Johansson, who bore him two daughters and a son. Soon a large number of collaborators came to the Nobel Institute of Physical Chemistry from all over Sweden and numerous other countries.

The Cepheid variables in the arms of the Andromeda Galaxy were found to be four times brighter than their counterparts. Hubble had previously used only the older stars to estimate the age of the universe based on the equipment he had at the time for observation, and he determined that Andromeda was 800,000 lightyears away, and the universe was approximately 1 billion light-years in size. But with Baade’s discovery of two kinds of Cepheid variables, with differing factors of brightness, using both Population I and Population II stars for computations allowed the astronomer to determine that Andromeda was actually 2 million lightyears away.

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A to Z of Scientists in Space and Astronomy. Notable Scientists [biographies] by Deborah Todd


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