1341–1360 of 2,477 results
A Full Crescent Moon

Observing

Meet the Meager March Moon

Baptized in the fire of yesterday's total solar eclipse, a very young crescent Moon emerges into the night sky.

Canyonlands National Park at night

Astronomy and Stargazing Projects

Help Keep Our Skies Dark — Join IDA Today

It's high time that we amateur astronomers got serious about protecting the night sky from light pollution.

Alson Wong's total eclipse photo

Observing

Watch Indonesia's Total Solar Eclipse Live!

On March 9th — late on Tuesday, March 8th, in the U.S. — the Moon will completely cover the Sun. Check here for the links you'll need to see this celestial spectacle as it happens.

This Week's Sky At a Glance

This Week's Sky at a Glance, March 4 – 12

Leo stands over bright Jupiter at nightfall this week. The Big Dipper glitters high in the northeast and Sirius blazes due south.

Butterfly Metamorphosis

Observing

NGC 2346: A Cosmic Butterfly Plays Peekaboo

Spiraling stars and light-soaking dust clouds enliven the heart of this lesser-known planetary nebula NGC 2346 in Monoceros. Will you be the first to catch it playing peekaboo again?

Jupiter and Leo in early March

Sky Tour Astronomy Podcast

Tour March's Sky: Jupiter Ascending

After months of excitement in the predawn sky, the action is shifting to the evening — where Jupiter rises early and the stars of Orion anchor an array of celestial sights.

This Week's Sky At a Glance

This Week's Sky at a Glance, February 26 – March 5

After dinnertime this time of year, four carnivore constellations stand in a row from the northeast to south: Ursa Major, Leo, Hydra, and Canis Major.

Strange Night Sights

Observing

Frightful Nights Under the Stars

The lure of dark skies often takes us to unfamiliar places where nocturnal animals and encounters with strangers can ignite our primal fears.

Omega Centauri from southwestern New Mexico

Celestial Objects to Observe

How To Get a Glimpse of Omega Centauri

Among globular clusters, the immense Omega Centauri is widely regarded as the most impressive in the sky. Its deep southern location makes this object challenging to spot — but it can be done, as Italian observer Giuseppe Pappa explains.

This Week's Sky At a Glance

This Week's Sky at a Glance, February 19 – 27

On Friday the waxing gibbous Moon shines below Castor and Pollux. On Tuesday the just-past-full Moon shines with Jupiter after they both rise at end of twilight.

Solids and Stripes

Observing

Jupiter Jumps Back Into The Evening Sky

Jove begins a new apparition with a redder Red Spot, pirouetting moons, and ever-changing cloudscapes.

active region 1520

Sun

How Astronomers Count Sunspots

A multi-year investigation revealed errors in our understanding of the Sun.

This Week's Sky At a Glance

This Week's Sky at a Glance, February 12 – 20

The biggest well-known star pattern is the Winter Hexagon, marked by the stars Sirius, Procyon, Pollux, Castor, Beta Aurigae, Capella, Aldebaran, and Rigel.

This Comma Will Make You Pause

Observing

Overlooked Wonders In Orion's Shadow

Put the Great Nebula in Orion in the backseat and pay a visit to its humble neighbors

This Week's Sky At a Glance

This Week's Sky at a Glance, February 5 – 13

See all five naked-eye planets at dawn, though Mercury is getting low. On Saturday morning, the crescent Moon, Venus, and Mercury form a triangle low in the southeast.

Venus-Mercury-Moon in early February 2016

Observing

Saturday Morning: Moon, Venus, and Mercury

Two planets and a pretty crescent Moon gather low above the southeastern horizon before dawn on February 6th.

Paired Together for Another Week

Planets

It's Not Over Till The Fast Planet Sinks

This week and early next will be your last chance to see five planets — six if you count Earth — at dawn.

Venus and Mercury on January 28th

Observing

Look Now to See Five Planets at Once!

The first days of February offer your best chance to see all of the naked-eye planets — from Mercury to Saturn — together with the Moon in the predawn sky.

This Week's Sky at a Glance logo

This Week's Sky At a Glance

This Week's Sky at a Glance, January 29 – February 6

The last-quarter Moon rises around 1 a.m. Sunday night, in company with Mars. By the dawn of Monday the 1st they're high in the south.

Venus-Mercury-Moon in early February 2016

Sky Tour Astronomy Podcast

Tour February's Sky: Five Planets at Dawn!

This month's audio sky tour starts before dawn, when you can spot all five bright planets by eye, and moves to the sparkling stars seen on winter evenings.