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How many stars can you see on a moonless night?
Have you ever wondered how many stars are visible on a given night? It depends on factors including how dark your sky is and what your age is.
September 9, 2026
Labor Day: Learn its history and traditions
Labor Day is a federal US holiday that falls on the 1st Monday in September and is considered the unofficial end of summer.
September 6, 2026
If we find life beyond Earth, how will nations respond?
If we ever find life beyond Earth, how will the nations of the world respond? A group of experts give 3 possibilities: cooperation, competition and isolation.
September 6, 2026
Sapphire: September birthstone comes in many colors
Sapphire, the September birthstone, is typically blue, the color caused by small amounts of titanium and iron in the crystal structure.
September 1, 2026
Best eclipse photos! Nearly total, August 27-28
EarthSky community photos of the lunar eclipse of August 27-28, 2026. Thanks to all who submitted eclipse photos!
August 28, 2026
Nepal flash flood nightmare: What caused it?
On August 26, 2026, a glacier collapse and landslide triggered a huge release of water. The Nepal flash flood wiped out villages and took untold lives.
August 27, 2026
Will you see colors in aurora? Or do you need a camera?
If you live below 50 degrees N. latitude, any aurora visible is likely to be low on your horizon, and you're less likely to see vivid colors.
August 25, 2026
Pluto demoted to dwarf planet 20 years ago today
Pluto is the largest of many small bodies in the outer solar system. That's partly why it was demoted from major planet to dwarf planet in 2006.
August 24, 2026
1st photo of Earth from the moon 60 years ago
As NASA plans to land astronauts on the moon with the Artemis IV mission in 2028, it's fun to see this 1st photo of Earth taken from the moon.
August 23, 2026
Ancient Amazon civilization might have been home to millions
Laser surveys have revealed hundreds of earthworks in the Amazon. Researchers estimate the ancient Amazon civilization could have supported 3 million people.
August 14, 2026
