221–240 of 2,476 results
Spica occultation map

Celestial Objects to Observe

Catch an Exciting Spica Occultation on July 13th

Don't miss Spica's dramatic disappearance at the Moon's dark limb. We also check in on the status of current bright comets.

Spica occulted by Moon

Sky Tour Astronomy Podcast

July Podcast: Spotlight on Spica

Grab your curiosity, and come along on this month’s Sky Tour. This month offers a chance to watch a dramatic coverup of the bright star Spica by the first-quarter Moon. You can also glimpse Mercury just after sunset — and Saturn very late in the evening.

This Week's Sky At a Glance

This Week's Sky at a Glance, June 28 – July 7

It takes hardly more than a glance up these evenings to check for the anticipated eruption of T Coronae Borealis, the Blaze Star.

T CrB map

Celestial Objects to Observe

Is the "Blaze Star" About to Blow? You May Be the First to Know

T Coronae Borealis is a nova star that's due to suddenly — and briefly — brighten. Here's how to see this once-in-a-lifetime event.

Omega Centauri as galactic nucleus

Southern Stargazing with Jonathan Nally

Centaurus Constellation: Glimpse the Greatest Globular

The Centaurus constellation holds some of the best southern targets, including the Omega Centauri globular cluster and the Centaurus A galaxy.

Jupiter barely emerging in bright dawn, June 22, 2024

This Week's Sky At a Glance

This Week's Sky at a Glance, June 21 – 30

The two brightest stars of summer balance across the zenith. Arcturus and Vega represent the two commonest spectral types, and colors, of all the naked-eye stars in the sky.

Planet parade

Observing

See the Real Planet Parade

Maximize your planetary pleasure and get re-acquainted with Earth's siblings during the June 29th dawn planet parade.

Moon crossing Scorpius, June 18-20, 2024.

This Week's Sky At a Glance

This Week's Sky at a Glance, June 14 – 23

On solstice week the brightening Moon moves across the evening sky from Spica to Scorpius. On Monday, it helps you find a piece of Centaurus from as far north as southernmost Canada!

M7 locator map

Celestial Objects to Observe

Meet Shaula: The Scorpion’s Triple-Pronged Stinger

Meet Shaula, the bright star on the Scorpion's tail. It's a challenge for northern observers, but easy to find if it clears the horizon!

Crescent Moon under Castor and Pollux, June 7-8, 2024

This Week's Sky At a Glance

This Week's Sky at a Glance, June 7 – 16

The waxing Moon reenters the sky as an evening crescent. Pollux and Castor keep it company. The Big Dipper hangs straight down. And can you still catch wintry Capella? The colder your latitude the better your chance.

Comet 13P/Olbers

Solar System

Comet 13P/Olbers Juices Up June Skies

June brings heat and bugs but also a moderately bright, early-evening comet that returns every 69 years.

Ophiuchus the Serprent Holder

Sky Tour Astronomy Podcast

June Podcast: Spotting the Serpent Charmer

Listen to this tour of the stars and planets that you’ll see overhead during June. Learn how to spot three planets before dawn, and to track down a snake-handler in the early summer sky. Grab your curiosity, and come along on this month’s Sky Tour.

Big Dipper with the stars labeled with the years the light we see in 2024 left them. (Image: IAU/ Arya Anthony)

This Week's Sky At a Glance

This Week's Sky at a Glance, May 31 – June 9

Arcturus and Vega highlight the evening, The Big Dipper quickly pivots. And sorry, tell your friends and family who ask that no "dazzling Parade of Planets" is blazing across the sky. Who makes this stuff up??

Moon and Saturn, May 31, 2024

This Week's Sky At a Glance

This Week's Sky at a Glance, May 24 – June 2

The Big Dipper twists around fast near the zenith, Arcturus almost claims the zenith, the Coma Star Cluster not far away can't quite hide, and T Cor Bor simmers ominously dim.

Galilaei crater May 20, 2024

Solar System

Why Did Galileo Get Such a Puny Crater?

Galileo was one of the first people to study the Moon through a telescope. You'd think he'd get more than 10-mile-wide crater for his efforts. But of course, there's more to the story.

Aldebaran about to be occulted by the waning gibbous Moon in daylight, Oct. 2, 2015

This Week's Sky At a Glance

This Week's Sky at a Glance, May 17 – 26

This week the Moon occults Beta Virginis, then Antares. The last star of the Summer Triangle finally rises before bedtime. On the other side of the sky, the Arch of Spring sinks low.

Aurora lights up a lake in the foreground with a horizon of trees with green towards the horizon and pink further up.

Observing

Severe Geogmagnetic Storm Has Arrived! Auroral Blast Expected Friday Night

A severe geomagnetic storm has just hit Earth — which means we could see auroras tonight! Here's what you'll need to know.

Moon, Capella, and Beta Tauri at dusk, May 10, 2024

This Week's Sky At a Glance

This Week's Sky at a Glance, May 10 – 19

The waxing Moon this week travels eastward from the horns of Taurus past the heads of Gemini, the Beehive in Cancer, then the forefoot of Leo on its way to occulting Beta Virginis.

Waning Moon passing Saturn and Mars in the dawn, May 4-5, 2024

This Week's Sky At a Glance

This Week's Sky at a Glance, May 3 – 12

This week in the moonless dark, the Summer Triangle appears over the eastern treetops star by star. Leo walks down toward the west. And the Sombrero Galaxy positions itself ideally on the south meridian for your telescope.

Eta Aquariids from Australia

Celestial Objects to Observe

Ready the Hot Cocoa and Recliner — Here Comes the Eta Aquariid Meteor Shower!

You might be tempted to sleep through this annual shower but then you'd miss seeing some of the fastest meteors around. Not to mention their parent is the most famous comet of all.