A Question and Answer Guide to Astronomy - download pdf or read online

By Pierre-Yves Bely

ISBN-10: 052118066X

ISBN-13: 9780521180665

Amazon has performed a disservice to these folks that got this booklet to determine the colourful illustrations within the iPad and iPhone. All colour has been stripped.
Many figures depend on colour differentiation to explain and clarify the content material. the colour must have been retained, given that now the kindle books may be learn on many units, together with desktops, that supply colour. differently, the publication description in amazon may still offer a disclaimer.
I do have one other kindle ebook that i will learn in colour at the cellphone, computing device and iPad, so it isn't a rule that every one kindle books are intrinsically black and white.

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Extra info for A Question and Answer Guide to Astronomy

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At what rate are the stars dying? The massive stars end their lives in supernovae, and they do so at the rate of about one star every 50 to 100 years in our galaxy. † The less massive stars such as the Sun, which are much more numerous, go nova and end their lives as planetary nebulae and white dwarfs at a rate of about one per year. There you have it: if one star, more or less, dies each year and seven are born, the population of the Galaxy is growing, albeit slowly. 31 Are there any isolated stars, outside of the galaxies?

4300 to 8300 K. This surprising temperature inversion is caused by the increased role of magnetic fields in transporting energy outward through the diffuse material. The magnetic fields are also responsible for the very high temperature in the solar corona: 1 million K. Magnetohydrodynamic waves propagate in this medium and dissipate their energy there, like ocean waves crashing on the shore. Despite its high temperature, † the corona is not “hot” because its density is extremely low. The conditions are similar to those inside a hot kitchen oven: the walls are far too hot to touch, but you can put your hand inside and the hot air will not burn you.

Credit: C. Burrows, NASA/ESA/STScI. If the white dwarf accretes a very large amount of material from its companion, it undergoes “runaway” nuclear fusion, an event that completely destroys the star in an explosion even more gigantic than that produced in a mere nova: this is a supernova. Such an explosion in which a star is completely destroyed can also occur at the end of the life of a single massive star. For a star of between one and eight solar masses, life ends with it ejecting most of its material in the form of a planetary nebula (Q.

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

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