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

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, due to the fact that now the kindle books could be learn on many units, together with desktops, that offer colour. in a different way, the booklet description in amazon should still offer a disclaimer.
I do have one other kindle publication that i will be able to learn in colour at the telephone, computing device and iPad, so it isn't a rule that each one kindle books are intrinsically black and white.

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Still further out is the Oort Cloud, the source of our long-period comets. The Oort Cloud may extend out as far as 100 000 AU (about 2 LY), and possibly harbors billions of rocky/icy objects of kilometer size (Q. 70). Despite their number, the total mass of all these small bodies is equivalent to only about three Earth masses. The Oort Cloud is so far out that the Sun’s gravity affects them weakly, and they can become influenced by the gravity of the nearest stars, which are only twice as distant.

In our neighborhood, the stars are so far apart that the risk of collision is very low. In globular clusters, however, where thousands of stars are crowded into a relatively small volume of space, collisions may be frequent. Evidence that this is actually happening in star clusters is provided by the presence of abnormally blue stars in them. When two stars do merge, they form a single, massive, very hot star which can be recognized by its intense blue color. All of the stars in a globular cluster were born at the same time, and any blue ones born then would already have “died” because massive stars such as these have very short lifetimes.

The core responds with an explosion of incredible violence, sending a titanic shock wave throughout the star. The explosion can be so stupendous and the star’s collapse so complete that the result can be the creation of a black hole. The explosion blows off a significant amount of hot material which expands rapidly outward at 5000–20 000 km/s, producing the dramatic brightening of a supernova. The brightening can be five billion times the brightness of the Sun. The matter ejected during the explosion is so hot that many nuclear reactions are triggered and a series of heavy chemical elements are produced.

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


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