SUNSET: 
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.
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.
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.
Going Deep: Perseus Galaxy Cluster
Looking for a new deep-sky challenge? Turn your scope toward ACO 426, the Perseus Galaxy Cluster.
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.
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.
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.
Minkowski Planetary Nebulae
Looking for an observing challenge? An expert observer offers advice for exploring the Minkowski catalog of planetary nebulae.
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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More from C. E. Barns's 1001 Celestial Wonders
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.
Beyond the Printed Page: Globular Cluster Simulations
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.
The Trifid Nebula
Here's some further reading on the stages of star formation visible in the Trifid Nebula, subject of the May 2016 issue's Going Deep column.
Two Cool Galaxies: M81 and M82
How many details can you see when you take a look at galaxies M81 and M82?
Adaptive Optics: Before and After
To expand on the feature article on adaptive optics in our May 2016 issue, we're including here a full gallery of before-and-after images. The effect of the technology is immediately visible - and astounding.
Understanding Cosmic Sound Waves
Ancient cosmic sound waves (aka baryon acoustic oscillations) shaped the universe we see today. These animations demonstrate how the universe's large-scale structure came to be.
Sky & Telescope Errata: 2016
Check here for a list of known errata in 2016 issues of Sky & Telescope. If you don't see the error you found, send us an e-mail and alert us.
Circumpolar Galaxies
On a single night at a remote site, Contributing Editor Steve Gottlieb observed 35 circumpolar galaxies. Here we're providing a complete list of those 35 galaxies,
Highlights from the International Planetary Patrol Program
Astronomers dedicated significant time and resources to studying the planets as deep-space exploration ramped up in the late 1960s and early 1970s.
Monster Galaxies
Take advantage of early evenings and dark winter skies — turn your scope southward to view some of the most massive objects in the universe.
Beyond the Printed Page: Soviet Stamps and Astronomy
Read on for an entertaining (and true) story on the Soviets, the morals of society, and astronomy.
