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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

Superkilonova: Double explosion could be first ever seen

Astronomers have detected a strange double explosion of a star and hypothesize that it is a kilonova following a supernova: a superkilonova.

EarthSky Voices

December 30, 2025

NASA’s SPHEREx observatory completes stunning 1st cosmic map

NASA's SPHEREx has produced its 1st cosmic map, revealing the entire sky in 102 colors. Take a look at this spectacular map.

EarthSky Voices

December 28, 2025

Strange ‘spider’ on Europa hints at water lurking below

Researchers say that a huge 'spider' on Europa likely formed when a crater-creating impact caused briny water to spill out onto the surface.

Paul Scott Anderson

December 27, 2025

No ocean on Titan? New research reveals slushy ice world

Scientists thought there was a global ocean on Titan beneath its icy surface. But a new study says the moon's interior may be more icy and slushy instead.

Paul Scott Anderson

December 26, 2025

Earth’s radio bubble marks how far our signals have traveled

Earth's radio bubble is the extent to which our radio broadcasts have traveled. The 1st intentional radio broadcast was on December 24, 1906. Where is it now?

Kelly Kizer Whitt

December 24, 2025