Enjoying EarthSky? Subscribe.

265,931 subscribers and counting ...

Larry Sessions

Will Betelgeuse explode someday?

Yes, it will. Someday the star Betelgeuse will run out of fuel, collapse under its own weight, and then rebound in a spectacular supernova explosion. Someday … but probably not soon.

How far is Betelgeuse?

Finding star distances isn’t easy. Here’s how it’s done, and why astronomers modified the distance estimate to the famous star Betelgeuse.

See a faint star cluster near bright Sirius

Sirius is easy to find. It’s the sky’s brightest star. If you have binoculars and a dark location, look near it for the star cluster M41.

Super effect on us from supermoons?

A supermoon’s extra pull of gravity creates higher-than-usual tides. But the moon’s pull doesn’t affect a human body nearly as powerfully as it does an ocean.

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.

Star of the week: Aldebaran

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.

Find the Geminid meteors’ radiant point

December’s Geminid meteor shower radiates from the constellation Gemini the Twins. To see it, look east in mid-evening or overhead by about 2 a.m.