2121–2140 of 2,263 results
The constellation Leo

Celestial Objects to Observe

The Lure of Variable Stars

Studying and recording the ups and downs of variable stars is a pleasant pastime that can also be scientifically rewarding. Here's a simple project to get you going.

Celestial Objects to Observe

Phenomena of Jupiter's Moons

Virtually any telescope will show Jupiter's four Galilean satellites and their interesting interactions with the planet or its shadow.

Sketch of Jupiter

Celestial Objects to Observe

Jupiter: The Ultimate Observing Guide

Viewing the solar system¹s largest planet can be more than fun — even with a modest telescope, you can make observations of lasting scientific value.

Celestial Objects to Observe

A Chain of Galaxies Near M92

Many interesting but faint objects are often overlooked when they're beside a "showpiece" object. A collection of galaxies near M92 are a good example of this.

Celestial Objects to Observe

A Galaxy-Hop in Leo

Even with a modest telescope and a poor sky, you can ferret out many faint, far galactic wonders by using a good map.

Celestial Objects to Observe

A Pair of Grand Galaxies

If you think all galaxies are faint, fuzzy blobs, think again. Here are two easily-seen galaxies that will change your mind.

NGC 2440

Deep Sky

A Collection of Bipolar Planetary Nebulae

Butterflies of the Milky Way await scrutiny with telescopes small and large.

The Helix Nebula

Deep Sky

Hunting Down the Helix

Despite its dodgy reputation, this planetary nebula is easy to find (for both Northern and Southern Hemisphere observers) if you go about it the right way.

Orion Nebula

Celestial Objects to Observe

A Pair of Nice Nebulae

When you leave the planets, moons, and comets of our solar system behind, you enter the realm of the deep sky, a place of subtle glows and faint lights.

Comin' our way Friday

Celestial Objects to Observe

Hunting Asteroids From Your Backyard

You can discover an asteroid tonight. Digital technology and the CCD revolution have given amateurs the ability to do it. Here's how.

Auroral curtain


Satisfy Your Auroral Longing

If you don’t live in Alaska or Iceland, you can improve your chances of seeing an aurora — and maximize your amount of sleep — by monitoring the level of geomagnetic activity.

Celestial Objects to Observe

Observing Amazing Nebulae Season by Season

Nebulae are among the most beautiful sights in the night sky but their diffuse nature can make them challenging to locate. Here are a few interesting nebulae, and most are easy to spot.

Deep Sky

Clusters of Clusters: Globular Pairings

Globular clusters are more concentrated in the direction of Sagittarius since that's where we find the center of the Milky Way. This area of the sky affords us opportunities to see several of these rich, ancient clusters in close proximity.

Deep Sky

Six Globulars Near Antares

If you can find bright Antares in Scorpius, you can use our chart to find these half dozen globular star clusters with a telescope — and maybe even binoculars.

Moon phases in perspective

Celestial Objects to Observe

A Month of Moonwatching

Whatever its phase, the magnificent Moon has lots to offer.

Deep Sky

Winter Clusters Galore

The sky between the Big and Little Dogs may be poor in bright stars, but it’s rich in star clusters for small telescopes.

Deep Sky

Open Clusters by the Season

Open clusters are popular targets for deep-sky observers, particularly when composed of varied-color stars. Here are some treats for scopes both large and small.

Deep Sky

A Sampling of Star Clusters

You don't need a big telescope to be dazzled by deep-sky wonders, particularly if your target is one of the many lovely star clusters.

The Straight Wall at last quarter

Celestial Objects to Observe

Ancient Thebit and Huygens's Sword

The absolute best example of a lunar fault is the Straight Wall. This well-known lunar feature is a long thin line that never fails to impress; even through a small telescope it's a fascinating sight.

Rising full Moon


What Is A Blue Moon in Astronomy?

Is Friday's full Moon "blue"? Depends on who you ask, but if someone answers yes, it's because of a mistake in a 1946 issue of Sky & Telescope.