July 16, 2017

Download A Question and Answer Guide to Astronomy by Pierre-Yves Bely PDF

By Pierre-Yves Bely

Amazon has performed a disservice to these people that obtained this publication to determine the colourful illustrations within the iPad and iPhone. All colour has been stripped.
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Extra resources for A Question and Answer Guide to Astronomy

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It really turns out to be no mystery, once we realize that the most fundamental property of a star is, precisely, its mass. A star’s mass governs all its other 15 16 Stars The Hertzsprung–Russell diagram for main sequence stars, in which luminosity is plotted against surface temperature. The numbers along the main sequence line refer to stellar masses, expressed in solar masses. The diagram can also be drawn up using the x-axis to show spectral classes or the color index of stars, each variant slightly changing the shape of the main sequence line.

A supernova? A nova – the name means “new” in Latin – is a star that suddenly becomes enormously bright. Novae were so named because they appeared where no star had been seen before, but that was simply because they had been too faint to be visible to the naked eye. And when they did become visible, it was because they had undergone a violent nuclear explosion. Most novae are the result of an explosion in a binary star system (Q. 17) in which one member of the pair has already exhausted its hydrogen to become a white dwarf (Q.

25 26 Stars Remains of the titanic dismemberment of a star: a supernova. This is Cassiopea A which exploded 10 000 years ago, but whose light reached us only in 1680. We recognize the various chemical elements by the color they emit: dark blue regions are rich in oxygen, red, rich in sulfur, and the white, pink, and orange regions contain mixtures of oxygen and sulfur. All these chemical elements will be recycled in the next generation of stars, perhaps incorporated into new planets and . . living beings?

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