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December has the longest days (wherever you live)
The longest days accompany the winter solstice. In December, a day - a whole cycle of day and night - is about half a minute longer than the average 24 hours.
December 18, 2025
Mysterious 3200 Phaethon is the Geminids’ parent object
3200 Phaethon is the weird comet-like asteroid that spawns the Geminid meteor shower. New research reveals more answers ... and questions.
December 12, 2025
Thinking of buying a telescope? Read these tips 1st
Are you thinking of buying a telescope? Here's how to know if you're ready, with tips on what 1st-time buyers should look for.
December 9, 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
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
A peek inside Webb’s Cosmos, in media we love
"Webb's Cosmos" is a new coffee-table book displaying some of Webb's greatest images. Learn more about the book and get a peek inside here.
November 28, 2025
What’s a red dwarf? Only the most abundant Milky Way star
A red dwarf star is the smallest and coolest type of star known. They're also extremely common, making up around 75% of the stars in the Milky Way.
November 19, 2025
Super Hunter’s Moon – 2025’s brightest full moon – on November 5-6
Watch for the Super Hunter's Moon - this year's November full moon - on November 5-6, 2025. It's the closest and brightest supermoon of 2025.
November 5, 2025
Open star clusters are loose groups of stars
Open star clusters are young, loosely bound gatherings of stars that may still be surrounded by the nebula - or space cloud - in which they were born.
November 5, 2025
The year’s earliest solar noon is on November 3
November 3 brings the year's earliest solar noon - that is, earliest midday - by nature's clock. It's a harbinger of the Northern Hemisphere's earliest sunset.
November 2, 2025
