81–100 of 437 results

Binocular Highlight

Star Clusters: Four for the Road

Using binoculars, find these four clusters that will fit comfortably in the same field of view — observe part of the structure of the galaxy made visible.

Cetus — Till Credner

deep sky wonders

The Inconstant Star

The joys of observing variable stars are predictably wonderful. Learn about these inconstant stars which are consistently delightful.

Sky & Telescope Magazine

Inside the December 2017 Issue

How We See Space: Juno at Jupiter, Machine Learning in Astronomy, Sketching the Stars, and Understanding Surface Brightness — S&T's December 2017 issue

Sky & Telescope Magazine

Stellar Splendor: An Extraordinary Encounter

An extraordinary encounter with the stars: the most peacefully (yet still stirringly) wondrous is the sight of a clear, dark sky filled with stars.

Sky & Telescope Magazine

The Vagaries of Crater "Tweens"

Some lunar impacts have characteristics that make them neither "simple" nor "complex." Think of them as the “young adults” of the Moon’s crater population.

celestial calendar

The Drama-Ridden Couple of R Aquarii

R Aquarii may look like a normal pulsing red giant — but it has a lot more going on around it. Its next episode of weirdness may begin soon...

Sky & Telescope Promotions

Join S&T's Live Webinar for Deep-Sky Imaging

Learn how to get the most out of your astro-imaging equipment with this informative live webinar hosted by S&T contributing editor Richard S. Wright, Jr.

Beyond the Printed Page

Sketching the Orion Nebula

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

Binocular Highlight

NGC 7331: Odd One Out

Can you spot September's Binocular Highlight from Mathew Wedel — spiral galaxy NGC 7331? Grab your binoculars and find a nice dark sky spot.

South America eclipse map

Sky & Telescope Promotions

S&T Webinar: When’s the Next Solar Eclipse?

If you loved seeing August's solar eclipse and are eager to see another one, don't miss this live webinar on upcoming total and annular solar eclipses.

Python Data Science Handbook

Beyond the Printed Page

Teach Yourself Machine Learning

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

Sky & Telescope Magazine

Inside the November 2017 Issue

The November 2017 issue of Sky & Telescope explores our celestial neighbors both near and far. Learn about upcoming missions to Mars, and more!

Sky & Telescope Magazine

M17: The Nebula With Too Many Names

Messier 17 (M17) has at least five proper names — Omega Nebula, Horseshoe Nebula, Checkmark Nebula, Swan Nebula, and the Lobster Nebula. Why so many?

Sara Seager

Sky & Telescope Promotions

S&T Webinar: Sara Seager on Exoplanets

Join renowned MIT researcher Sara Seager for a fascinating behind-the-scenes look at how we're readying the technology to find and study planets like Earth

deep sky wonders

Showpiece Doubles

Point your telescope towards these doubles — true gems of the late-summer sky. You don’t even need dark skies or a big telescope to admire them!

asteroid

Asteroid 22410 Grinspoon: My Rock of Ages

David Grinspoon shares his thoughts on being immortalized far out in the asteroid belt and his namesake, asteroid 22410 Grinspoon.

Beyond the Printed Page

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

Beyond the Printed Page

Abell 194

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

Sky & Telescope Magazine

Inside the October 2017 Issue

We strive to understand the universe as the universe itself ages. What will the solar system look like in 6.5 billion years? Is there a ninth planet? What is going on in the R Aquarii system?

Sky & Telescope Magazine

Diamond of Three Rings

A total solar eclipse offers the most spectacular of jewels, the diamond ring, as the Moon blocks all but a small part of the Sun's brilliance.

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