Posts by 

Larry Sessions

Summer Triangle star: Altair spins fast!

Altair is only 16.8 light-years from Earth, making it one of our closest stellar neighbors. It's variable in an usual way, and it spins fast!

Summer Triangle star: Deneb is distant and luminous

When you gaze at the bright star Deneb, Tail of the Swan, you’re gazing across thousands of light-years of space at one of the bright stars of the huge Summer Triangle asterism.

Summer Triangle star: Vega is bright and blue-white

There's a noticeable star pattern called the Summer Triangle in the east on July and August evenings. Its brightest star is blue-white Vega.

Ruby red Antares is the Scorpion’s Heart

Red Antares, Heart of the Scorpion in the constellation Scorpius, is a mighty star, a red supergiant.

Arcturus, brightest star of the north

Arcturus is the 4th brightest star in the sky and the brightest star north of the celestial equator. One of the easiest stars to locate due to its position off the handle of the Big Dipper, you can look for it on spring evenings in the Northern Hemisphere.

Moon and Gemini stars on April 18 and 19

Watch for Gemini's 2 brightest stars - Castor and Pollux - near tonight's moon. On the other side of the moon, you'll see a 3rd bright star. It's Procyon in the constellation Canis Minor, the Lesser Dog.

Beta Centauri is a Southern Pointer Star

Beta Centauri isn’t as famous as Alpha Centauri, but together, these brilliant Southern Hemisphere stars have inspired legends and guided mariners.

Leo loses his tail. We gain a constellation

The constellation Leo once had a tail, a clump of faint stars. Now these same stars are known as Coma Berenices, the hair of a queen.

Alpha Centauri, star system closest to our sun

Our closest stellar neighbors are the 3 stars that make up the Alpha Centauri system. They lie just over 4 light-years - about 25 trillion miles or 38 trillion km - away.

The Coma Cluster contains thousands of galaxies

Myriads of galaxies, visible only to those with medium-to-large telescopes, shine among the stars in the "Realm of the Galaxies." Study of the Coma Cluster of galaxies aided in the discovery of dark matter.