Astronomy by annonymous

By annonymous

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A star is an enormous sphere of hot gases. It is as simple, or as complex, as that, whichever way you wish to look at it. Of course, the processes involved in making and maintaining a star are, as expected, very, very complex! 28 By and large, most stars are nearly entirely made of hydrogen, less helium, and very small amounts of everything else. This composition is usually about 75% hydrogen, 24% helium, and the remainder metals. This ratio may change, however, since very old stars are nearly all hydrogen and helium with tiny amounts of metals, and very new stars can contain as much as 2–3% metals.

Most of the nearest stars are very faint, so only the brighter ones will be mentioned here. Exceptions to this will be made, however, if the object has an important role in astronomy. A companion book to this one—Field Guide to the Deep Sky Objects—provides much more information and detail regarding the nearest stars. Furthermore, the Field Guide addresses many techniques to enhance your observational skills, such as dark adaption, averted vision, etc. Tools of the Trade 10. 11. 12. 13. 14. 15.

We have just not been able to see them up until now. 1 Introduction When we look up into the night sky, we see stars, and not much else. So we get the impression that between the stars, space is empty. There does not seem to be any sort of material that lies between one star and another. At the same time, we know intuitively that this cannot be true, for if space were empty, from what did stars form? This then leads us to the conclusion that perhaps space is not quite so empty, but filled with some sort of material that, to our eyes, is all but invisible yet is responsible for providing the source material for stars.

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