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World Space Week is October 4 to 10. Find events here

World Space Week dates back to 1999 and runs every year from October 4 to 10. This year, the theme is The Rocket Revolution. Find events near you here.

Kelly Kizer Whitt

October 4, 2026

October birthstone: Colorful opal and tourmaline

Take your pick: the October birthstone is either the striking iridescent opal or the many-colored tourmaline. Learn the lore of these pretty gemstones here.

Editors of EarthSky

October 3, 2026

Is there enough water on the moon for future cities?

Is there enough water on the moon for future cities? New estimates say there could be enough for smaller villages or towns, but not larger metropolises.

Paul Scott Anderson

September 25, 2026

Neptune discovered on this date 180 years ago

Read the fascinating story of the discovery of Neptune - 180 years ago - on September 23, 1846. It was the 1st planet to be discovered by using mathematics.

EarthSky Voices

September 23, 2026

6th batch of Pentagon UAP files: Air Force talk and more

The 6th batch of the Pentagon UAP files has just been released. Read about a U.S. Air Force talk on UAP from 1952, see more videos and more.

Paul Scott Anderson

September 20, 2026

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.

Editors of EarthSky

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.

Kelly Kizer Whitt

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.

EarthSky Voices

September 6, 2026