Enjoying EarthSky? Subscribe.

272,987 subscribers and counting ...

Larry Sessions

Bellatrix, in Orion, means Female Warrior

You might know Rigel and Betelgeuse, Orion’s brightest stars. Now meet 2 more stars in Orion, called Bellatrix and Saiph.

Focus on stars Betelgeuse and Rigel

Many constellations have a bright star, but Orion has two: Rigel and Betelgeuse.

Aldebaran is the Bull’s fiery eye

Aldebaran – brightest star in Taurus the Bull – is huge! If it replaced our sun, its surface would extend almost to the orbit of Mercury.

Was the Christmas Star real?

Some possible astronomical explanations for the Star of Bethlehem or Christmas star.

Can you see stars’ different colors?

Late December is the perfect time for noticing the colors of the stars. Never noticed them? Our sky chart can help guide your eye.

Achernar is the End of the River

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

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.

Shedding light on the moon’s dark side

A far side of the moon remains hidden from Earth, but doesn’t stay permanently dark.

Alpheratz is part of the Great Square

Finding the star Alpheratz can help you spot the Andromeda Galaxy, the nearest large spiral galaxy to Earth.

5 myths about the moon

Moon myths, take that! Here are 5 of the most common myths about our moon explained.