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What are the best targets for binoculars?

The best targets for binoculars in the night sky are the moon, planets, star clusters and nebulae. You can even catch the smudge of distant galaxies in them.

Kelly Kizer Whitt

February 4, 2026

Full moon names of 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

February 1, 2026

Happy Groundhog Day! Will Phil see his shadow?

The predicted high for Punxsutawney, Pennsylvania, on February 2, Groundhog Day, is 24 degrees F (-4 C) and cloudy. Will Phil see his shadow?

Editors of EarthSky

February 1, 2026

The moon’s terminator line divides night and day

The moon’s terminator line divides day and night on the moon. As we see it from Earth, it marks the line of lunar sunsets or sunrises. Read more.

Kelly Kizer Whitt

January 25, 2026

Which Milky Way spiral arm contains our sun?

Where do we live in the Milky Way galaxy? We lie between the major arms in a smaller spiral arm known as the Orion Arm. See diagrams here.

Editors of EarthSky

January 22, 2026

Here’s what ‘habitable’ means to astronomers

When astronomers say a distant world is 'habitable,' what do they mean? Do they mean humans could live there? Do they mean we've discovered alien life?

Kelly Kizer Whitt

January 18, 2026