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Lunar occultation of Mars on January 13, 2025. Images here!

The full Wolf Moon passed in front of red Mars for some observers last night. Here are some great images of the lunar occultation of Mars.

Cristina Ortiz

January 14, 2025

What is the Big Bang?

In the view of modern cosmologists, the Big Bang is the event that marked the birth of our universe. What was it - when was it - and what are modern theories?

Andy Briggs

January 1, 2025

Comets are icy balls of gas, dust and rock

Comets are diffuse balls of ice and dust orbiting the sun. They're sometimes visible in our skies. A comet's tail can stretch millions of miles across space.

Editors of EarthSky

November 28, 2024

Gegenschein is the glow of interplanetary dust

The gegenschein is a play of light on interplanetary dust of the solar system. It's a diffuse path of light that lies exactly opposite the sun.

EarthSky Voices

November 27, 2024

Is there a North Star for Mars?

Is there a North Star for Mars ... a guide star for future explorers? Not in any satisfying way. But Martian stargazers wouldn't lack for things to see!

Deborah Byrd

November 17, 2024

Mirach is your guide star to finding 3 galaxies

Mirach in the constellation Andromeda helps stargazers locate the Andromeda Galaxy, the Triangulum Galaxy, and "Mirach's Ghost" (NGC 404).

Bruce McClure

Shireen Gonzaga

November 10, 2024

Alpheratz belongs to Andromeda, but is part of the Great Square

Alpheratz appears to our eyes as a single star but it is actually a close binary star system. Many stargazers use it to locate the Andromeda galaxy.

Larry Sessions

Deborah Byrd

EarthSky Voices

October 9, 2024

Annular solar eclipse today! See a ring of fire

Today, an annular solar eclipse will cross over parts of South America, the Pacific Ocean, the Atlantic Ocean, and Antarctica. Watch a livestream here.

Editors of EarthSky

October 2, 2024