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Are Uranus and Neptune rock giants and not ice giants?

Are Uranus and Neptune really ice giants as scientists have long thought? A new study suggests they might be much more rocky instead of icy on the inside.

Paul Scott Anderson

January 1, 2026

Dwarf planet Ceres discovered 225 years ago today

Dwarf planet Ceres was discovered by Giuseppe Piazzi on January 1, 1801. That was 225 years ago. It was 1st considered an asteroid.

Editors of EarthSky

January 1, 2026

The moon illusion makes the moon look huge!

When you see a large-looking moon low in the sky, does the moon look bigger to you? That's the moon illusion that makes the moon look so big.

Deborah Byrd

January 1, 2026

Deep-sky objects: Small telescope and binocular targets

Deep-sky objects - including bright and dark nebulae, star clusters and distant galaxies - are favorite targets for amateur stargazers.

Kelly Kizer Whitt

January 1, 2026

Planisphere: Your friend to find stars and constellations

A planisphere is an easy-to-use tool that can help you learn the night sky. Align the date and time to see what constellations and stars are overhead.

Bruce McClure

Deborah Byrd

January 1, 2026

How often do 7 eclipses occur in 365 days?

It's rare to have 7 eclipses in a calendar year. It's less rare to have 7 eclipses in 365 days. There are 7 eclipses in 365 days 29 times in the 21st century!

Bruce McClure

January 1, 2026

What’s the youngest moon you can see with your eye alone?

It has long been a sport for skywatchers to spot the youngest moon after sunset, with the eye alone. What does it take to see a very young crescent moon?

Bruce McClure

Deborah Byrd

January 1, 2026

How often are there three eclipses in one month?

We last had three eclipses in one lunar month in 2020. It'll next happen in the year 2029. From 2000-2050, there are 3 eclipses in one lunar month 14 times.

Bruce McClure

January 1, 2026