Enjoying EarthSky? Subscribe.

274,452 subscribers and counting ...

Larry Sessions

Moon and Gemini stars May 18 and 19

Gemini’s 2 brightest stars – Castor and Pollux – represent twins in many cultures.

How Leo the Lion lost his tail

And how we gained a new constellation. Read about the Lion and the Queen’s Hair, one of skylore’s most famous legends, here.

10 surprises about our solar system

Here are 10 unexpected and intriguing facts about our solar system – our sun and its family of planets – you probably did not know!

Quietly, Regulus ushers in springtime

Regulus, brightest star in Leo the Lion, is now rising in the east after sunset. You might not notice it, but stargazers know that, when Regulus appears in this way, spring is near.

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.

EarthSky Newsletter

Nearly half a million daily subscribers love our newsletter. What are you waiting for? Sign up today!

Join now to receive free daily science news delivered straight to your email.