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Almach is a quadruple star system

Almach looks like 1 star to the eye and like a colorful duo through a telescope. But today we know Almach as 4 stars.

Photos of this week’s spectacular dawn

Favorite photos from around the globe of Venus, Jupiter, Mars and the moon, which put on a show in the east at dawn this week. Thanks to all who submitted or posted at EarthSky Facebook.

November’s Leonid meteor shower

Here are all the details you need for 2017’s Leonid meteor shower, at its best on the mornings of November 17 and 18.

Don’t miss Jupiter and Venus at dawn!

Spectacular Venus-Jupiter conjunction on Monday! These are the 2 brightest planets, and they’ll be less than a moon-width apart. If you do miss them on Monday, keep watching. The moon is about to sweep past them.

Achernar is the End of the River

Achernar – aka Alpha Eridani – is the 9th brightest star in the sky and the flattest star known.

Pleiades star cluster, aka Seven Sisters

November’s often called the month of the Pleiades, because it’s when this star cluster – aka the Seven Sisters – shines from dusk until dawn.

See it! Full Hunter’s Moon

This weekend’s Hunter’s Moon, as captured by EarthSky friends around the world. Thank you to all who submitted photos!

What is the moon illusion?

Ever noticed a rising full moon appear huge on the horizon? It’s called the “moon illusion,” and it’s a trick your brain is playing.

2017 Hunter’s Moon on night of November 3

The Northern Hemisphere’s full Hunter’s Moon for 2017 falls the night of November 3. Will it be bigger, brighter, more colorful?

Pisces? Here’s your constellation

How to see the constellation Pisces. Plus sky lore and science.

Al Risha knots Fishes of Pisces

The star Al Risha in the constellation Pisces is not bright. But – at the tip of the graceful V in Pisces – it’s very noticeable.

November 2017 full moon a supermoon?

The 11th of 2017’s 12 full moons falls on November 3-4. It’s the 2nd-closest full moon in 2017, but is it a supermoon?

Taurid fireballs this weekend?

Although a modest shower, perhaps offering 5 meteors per hour, the Taurid shower just might produce some fireballs under the light of the full moon.

November guide to the bright planets

As November opens, Venus and Mars are up before dawn. Jupiter peeps over the sunrise horizon after November’s 1st week and sweeps spectacularly near Venus. Saturn and Mercury are evening planets.

Halloween is a cross-quarter day

The 4 cross-quarter days fall between equinoxes and solstices. Halloween is the spookiest one – derived from a sacred festival of ancient Celts and Druids – coming as days grow short and nights long in the Northern Hemisphere.

Small Magellanic Cloud orbits Milky Way

You need to be in Earth’s Southern Hemisphere to see the Small Magellanic Cloud. It looks like a luminous cloud, but it’s really a dwarf galaxy, orbiting our Milky Way.

Algol is the Demon Star

What’s the scariest star in all the heavens? Around Halloween, look for Algol – a star named for a demon!

Mirach is guide star to three galaxies

The orange-colored star Mirach in the constellation Andromeda acts as your guide star to 3 different galaxies.

International Observe the Moon Night

A global, public event coming up on October 28. Click in for links to events near you, and to learn how to participate online.

Watch for zodiacal light or false dawn

It’s not too late to see the zodiacal light, an eerie light extending up from the horizon before true dawn begins to light the sky. Southern Hemisphere? Look after sunset!