281–300 of 405 results
Beacons in Interstellar Fog

Explore the Night with Bob King

The Merope Nebula and Its Well-Kept Secret

Did you know that the brightest part of the Merope Nebula in the Pleiades is also the hardest to see? We'll make sense of this seeming contradiction while honing key observing skills.

Haunted Skies

Explore the Night with Bob King

Spooky Nebulae for Halloween Nights

While the kids are gathering sweet treats this Halloween, get a celestial scare with these frightful deep-sky sights.

Celestial Objects to Observe

8th-magnitude Nova in Sagittarius

A nova in Sagittarius, discovered a few nights ago by a Japanese amateur, has become bright enough to see in binoculars.

Northern Lights

Celestial News & Events

More Auroras Coming to Northern Skies

Keep your eye on the northern sky. Auroras are in the forecast for the next couple nights courtesy of a "hole" in the Sun's corona.

Needles in a Starry Sky

Explore the Night with Bob King

Halley On Fire! Orionids Peak This Week

The annual Orionid meteor shower is active all week, peaking Friday morning October 21st. If you're up before dawn, you might just see these Halley's Comet castoffs come to life.

Sharpen Your Skills on Sharpless 2-132

Explore the Night with Bob King

Plant Your Eyes In Delta Cephei's Fertile Triangle

The famous variable star Delta Cephei unlocks a box deep-sky treasures in a little-visited corner of Cepheus, the King.

Celestial Objects to Observe

Resolving Andromeda — How to See Stars 2.5 Million Light-Years Away

At 2.5 million light-years away, you might think it's impossible to see individual stars in the Andromeda Galaxy. Let its largest star cloud, NGC 206, show you the way.

Feather of Dusty Light

Explore the Night with Bob King

Mercury Punctuates The False Dawn

Early risers get a triple treat this week and next: a ravishing dawn Moon, an excellent apparition of Mercury, and a hint of Halloween in the ghostly zodiacal light.

Stellar Beauties

Explore the Night with Bob King

Will the Real Albireo Please Stand Up?

A stunning double star, Albireo is also a bit of an enigma. Is it a true binary or the result of a chance alignment?

Mystery Object? No, Just Sirius

Explore the Night with Bob King

Why Are There So Many UFOs?

In an age when UFO sightings are rife, we look at other possibilities that may help to explain the strange apparitions many see.

Lava Bumps Near Copernicus

Celestial Objects to Observe

A Little Guide to Lunar Domes

With this week's waxing Moon, we set off to explore its volcanic past with a look at a dozen intriguing lunar domes.

Three in a Row Show

Explore the Night with Bob King

Enjoy Orion in Shirtsleeves

Throw open the door and welcome back Orion at dawn. The Hunter's return brings relief from the heat and gives us a fresh shot at exploring untouched winter deep-sky objects in comfort.

New Planetary Nebula in the Making

Explore the Night with Bob King

Polarized Light: From Blue Sky to Egg Nebula

Bees see polarized light and use it to navigate to honey. Learn how you can use it to crack the Egg Nebula.

Cast of Sparkling Characters

Explore the Night with Bob King

Palling Around With Palomar Globular Clusters

The intriguing Palomar globular clusters will challenge observers with modest to large telescopes, while providing a satisfying ramble around the galactic halo.

Bright Star An Ancient Link

History and Sky Lore

A Real Scorcher! — Sirius At Heliacal Rising

Make a connection to a time when stars were used to track seasons and predict natural events by watching the heliacal rising of Sirius.

Celestial News & Events

Comet 29P/Schwassmann-Wachmann 1 Blows Its Top . . . Again!

An otherwise faint and distant periodic comet underwent a bright outburst at the end of last month. Now it's visible in amateur telescopes at nightfall.

Delta Aquarid meteor

Celestial News & Events

Delta Aquariids Kick Off Summer Meteor Showers

The meteors are coming! Three annual meteor showers are already active and guaranteed to spark up your summer nights.

Visibility zones for Two Occultations

Explore the Night with Bob King

See Two Tricky Occultations — Neptune and Lambda (λ) Aqr

Now you see 'em, now you don't. Watch the Moon occult Neptune and nearby Lambda Aquarii on the same night.

Land of Black and Light

Celestial Objects to Observe

Paddle the Milky Way's Dark River

Take an imaginary journey in a boat down the Milky Way's Great Rift, exploring rich star clouds and dark nebulae along the way.

Extra-large Donut


Aurora at Your Fingertips

A survey of free services and apps that let you keep tabs on space weather so you can anticipate the next great aurora.