EarthSky | Updates on your cosmos and world

The Artemis Accords are rules for a new moon era

September 25, 2026

Neptune at opposition on September 26, 2026

Neptune at opposition -- when it's opposite the sun on the sky's dome -- comes on September 26, 2026. You'll need optical aid to spot it.

Editors of EarthSky

September 25, 2026

Human World

Space

Is there enough water on the moon for future cities?

Is there enough water on the moon for future cities? New estimates say there could be enough for smaller villages or towns, but not larger metropolises.

Paul Scott Anderson

September 25, 2026

Astronomy Essentials

Seeing Saturn’s rings: Top tips for beginners

If you want to see Saturn's rings, late September and early October 2026 is a great time to look. Grab a telescope and read the tips found here!

Editors of EarthSky

September 25, 2026

Sun

Sun news: Fast wind arrives, auroras up north

Sun news September 25, 2026: Fast solar wind arrived, stirring Kp 4 and high-latitude auroras. Meanwhile, AR4536 just grew a delta. Stay tuned!

September 25, 2026

The red planet shows strange swirls of purple and pink

Mars Express captured this view of the red planet showing it in less familiar purple, pink and blue shades. Read why the red planet looks purplish.

Kelly Kizer Whitt

September 24, 2026

Space

Curiosity rover insights after 5000+ sols on Mars

Curiosity rover has now spent 5,000 sols — the equivalent to 5,000 Martian days, or more than 14 years — on Mars. Here's a look at some of its discoveries.

Kelly Kizer Whitt

Deborah Byrd

September 24, 2026

Earth

Would a Yellowstone supervolcano eruption end humanity now?

Yellowstone has undergone 3 massive super-eruptions in the past. If the Yellowstone supervolcano erupted today, would humanity survive?

EarthSky Voices

September 24, 2026

Astronomy Essentials

Tonight

Visible planets and night sky guide for September and October

Visible planets and night sky guide: Watch for the Harvest Moon this weekend. And see a video here about Harvest Moon science and folklore.

September 24, 2026

Full moon names by the month and by the season

Lists of common full moon names — both by month and by season — for North America. And a word about full moon names in the Southern Hemisphere.

Editors of EarthSky

September 24, 2026

Tonight

Why can’t I find the Big Dipper in September?

On northern autumn evenings, the famous Big Dipper lies low on - or even below - the northern horizon. You can use it to find Polaris, the North Star.

Larry Sessions

September 24, 2026