21–40 of 203 results

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Extragalactic Globular Clusters

Look here for all you need to know to go above and beyond (our galaxy) to find some extraordinary extragalactic globular clusters! Off to hunt extragalactic globular clusters? Below you'll find an abundance of resources compiled by Contributing Editor Steve Gottlieb to help you plan and execute your observing sessions.…

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Celestron at NEAF 2018

Renowned astronomer and Sky & Telescope contributor Dennis di Cicco visited with Celestron at NEAF 2018.

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Finger Lakes Instrumentation at NEAF 2018

Renowned astronomer and Sky & Telescope contributor Dennis di Cicco visited with Finger Lakes Instrumentation at NEAF 2018

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Sky-Watcher USA at NEAF 2018

Renowned astronomer and Sky & Telescope contributor Dennis di Cicco visited with Sky-Watcher USA at NEAF 2018.

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Enjoy this excerpt from CHASING NEW HORIZONS: Inside the Epic First Mission to Pluto, by Alan Stern and David Grinspoon. Stay tuned for a full review in our December 2018 issue.

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Going Deep March 2018: AGN Finder Charts

Explore distant supermassive black holes with these finder charts for "Ancient Photons from AGN" by Al Lamperti, which appeared in the March 2018 issue of Sky & Telescope.

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Sky & Telescope Errata 2018

Despite every effort to make every issue error free, mistakes occasionally make their way into print. Here's a list of known ones for 2018.

Thames, southern England, and France

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Balloon Astronomy: From Launch to Landing

Balloon astronomy is really taking off, writes Laura Fissel (NRAO) in the February 2018 issue of Sky & Telescope. She should know — as a member of the adventure-prone Balloon-borne Large Aperture Submillimeter Telescope (BLAST) team, she has been involved in multiple balloon telescope launches, part of her effort to…

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Sketching the Orion Nebula

Learn how to sketch the Orion Nebula at the telescope from Sky & Telescope Contributing Editor Howard Banich's experience.

Python Data Science Handbook

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Teach Yourself Machine Learning

Curious about machine learning? Learn about the inner workings of machine-learning algorithms without writing a line of code.

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Hickson Compact Groups

Contributing Editor Ted Forte offers a look at Hickson Compact Groups in the November 2017 issue of Sky & Telescope. In 1982, Canadian astronomer Paul Hickson published a list of 100 compact galaxy groups based on his examination of the Palomar Observatory Sky Survey (POSS) red plates. A compact group,…

Abell 194 Galaxy Cluster

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Abell 194

Sky & Telescope Contributing Editor Ken Hewitt gives us a guided tour through Abell 194, a visually rich galaxy cluster in Cetus.

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Observing Notebooks

Sky & Telescope's Observing Editor offers a few suggestions to help you set up your first (for fifth!) observing notebook. Feeling inspired after reading Contributing Editor Bob King’s article on observing notebooks in the September 2017 issue of Sky & Telescope but need help starting a notebook? Here are a…

Messier 17 Sketch Howard Banich

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Beyond the Printed Page: Messier 17

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…

20 Draconis

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Draco Double Stars

Contributing Editor Matt Wedel offers more double and multiple stars to look for in and around the head of the constellation Draco, the Dragon.

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Abell Planetaries

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…

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Beyond the Printed Page: A Modern Standing-Stone Calendar

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?

NGC 5907 and stellar stream loops

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Stellar Streams in Galaxy Halos (A Gallery)

Stellar streams are the remains of dwarf galaxies that once orbited the Milky Way. We showcase here stunning images of these galactic ghosts.

Earth-size planet Kepler-186f

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What Makes a Planet Habitable?

In our March 2017 issue we included a diagram of all small, confirmed exoplanets in their stars’ habitable zones. Here’s the saga of how we decided which planets to put on that list.

Eridanus II ultra-faint dwarf galaxy

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Ultra-faint Companions to the Milky Way: A Gallery

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.