21–40 of 196 results
Thames, southern England, and France

Beyond the Printed Page

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…

Beyond the Printed Page

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.

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Sky & Telescope Errata: 2017

If you see something questionable in a recent issue of Sky & Telescope magazine, check here to see a list of clarifications and errors that have been found.

NGC 1275

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Going Deep: Perseus Galaxy Cluster

Looking for a new deep-sky challenge? Turn your scope toward ACO 426, the Perseus Galaxy Cluster.

Akatsuki spacecraft

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Active Space Missions in 2017

Sky & Telescope has put together a digest of active missions in 2017. We’ve included astrophysics, planetary, gravity, solar, space weather, and stellar projects.

Eta Carinae

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A 3D View of Eta Carinae

New research on Eta Carinae featured in S&T's October 2016 issue lets you peer in and around Eta Carinae's Homunculus Nebula.

Reference fields for relativity test

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My Do-It-Yourself Relativity Test

Here's an update on an amateur astronomer's amazing effort to prove that Einstein really was right during next year's total solar eclipse.

Mink 1-65 Planetary Nebula

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Minkowski Planetary Nebulae

Looking for an observing challenge? An expert observer offers advice for exploring the Minkowski catalog of planetary nebulae.

Hercules Galaxy Cluster.

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Hercules Galaxy Cluster: Going Deep

To aid your observing endeavor, Contributing Editor Steve Gottlieb has provided an expanded table of galaxies, with their position angles, visual magnitudes, size, and positions.

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