No matter what you call it, Messier 17 is one deep-sky object to which you'll find yourself returning throughout your observing life. In our September 2017 issue, Contributing Editor Howard Banich examined the science and history of Messier 17, an H II region in Sagittarius also known as the Swan…
If you're looking for an observing challenge, George Abell's complete catalog of planetary nebulae has you covered. I observed my first planetary nebula by accident. I was moving the optical tube of my new telescope up and down, back and forth, nearing epic levels of frustration as I hunted for…
Why would an amateur astronomer build a standing-stone calendar, thousands of years after the last ones were erected by his distant ancestors in the British Isles?
Peruse a gallery of ultra-faint galaxies, the subject of Keith Bechtol's feature article in the April 2017 issue of Sky & Telescope. Wide-field surveys are accelerating discoveries of these elusive companions to the Milky Way.
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Here is Jim Mullaney's much longer sample of objects from this delightful 1927 amateur-astronomy guide, in order of right ascension, followed by more illustrations of the book.
Watch a million stars age in these prize-winning simulations of globular clusters. The simulations track the stars' movements and evolution over 12 billion years.