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Illustrated Guide to Astronomical Wonders by Barbara Fritchman Thompson, Robert Bruce Thompson

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iIntroduction to DSO Observing

Until the 1970s, most amateur astronomers spent most of their time observing Solar system objects—the moon, planets, and comets. Nowadays, although Solar system objects remain popular observing targets, many amateurs devote most of their time to observing DSOs (Deep-Sky Objects or Deep-Space Objects). Multiple star observing has also become popular. (Although multiple stars are technically DSOs because they lie far outside the Solar system, many astronomers reserve the term DSO for remote objects other than multiple stars.) In this chapter, you’ll learn what you need to know to get started observing multiple stars and DSOs successfully.

Multiple Stars

A multiple star (MS) is two or more stars that appear to be ...

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