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Posts by
Editors of EarthSky
Interstellar object Comet 3I/ATLAS leaving the solar system
Interstellar object Comet 3I/ATLAS makes it closest pass by Earth today (December 19, 2025). How close will it come? And where will it go after this?
December 19, 2025
Year’s shortest season to start at December solstice
The year's shortest season - between the December solstice and March equinox - is about 89 days. It's 5 days shorter than the longest season.
December 18, 2025
What’s a green flash and how can I see one?
Have you ever seen the green flash from a setting sun? Learn how to see one here, plus how they appear, and enjoy some great photos and watch a video!
December 18, 2025
The Wright brothers succeeded 122 years ago
The Wright brothers made aviation history on December 17, 1903, taking humanity’s 1st powered flight into the skies at Kitty Hawk.
December 17, 2025
Schedar shines brightly at the Queen’s heart
Schedar is the brightest star in the distinctive W-shaped northern constellation Cassiopeia and is visible most of the year from northern latitudes.
December 10, 2025
The last full supermoon of 2025. Best pics here!
The full Cold Moon on December 4 was the last supermoon of 2025. See a gallery of photos of the last full supermoon from the EarthSky community here.
December 5, 2025
December birthstone: turquoise, zircon or tanzanite
The December birthstone is 1 of 3 gemstones, the exquisite blue-green turquoise, dazzling zircon, or the magnificent blue-violet tanzanite. Your choice!
December 5, 2025
December full moon is the Cold Moon and a supermoon
The 2025 December full moon will occur on December 4. It's also a supermoon, the last supermoon of 2025. It will look very bright. Don't miss it!
December 3, 2025
EarthSky’s lunar calendar: How to use this great gift!
Follow the moon! Here’s why you need an EarthSky lunar calendar, the top tips for using it and where you can order one.
December 3, 2025
Does a supermoon have a super effect on us?
The extra pull of gravity from a supermoon creates higher-than-usual tides. But the effects of a supermoon on a human body are imperceptible.
December 1, 2025
