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Space
Summer solstice in Mars’ southern hemisphere is April 25
The summer solstice in Mars' southern hemisphere will fall on April 26, 2026. Will big dust storms fall this year?
April 22, 2026
Earth
Human World
Why do we celebrate Earth Day on April 22?
April 22 is the date of Earth Day in part because of Arbor Day, an earlier observance. The focus for 2026 is "Our Power, Our Planet."
April 22, 2026
Space
Today's Image
Earth images from space: 10 incredible photos of our planet
Happy Earth Day tomorrow! As a celebration of Earth, enjoy these photos, a collection of the 10 best Earth images from space. What are your favorites?
April 22, 2026
Sun
Sun news: Sun-stuff could reach Earth this week
Sun news for April 22, 2026: A blast of sun-stuff may glance Earth on April 24, bringing an increased chance for auroras.
April 22, 2026
Earth
A pileus cloud means bad weather is on the way
A pileus cloud looks like a curved, white cap on the top of a towering cumulus cloud. Pileus clouds are a sign that bad weather is on the way.
April 22, 2026
Astronomy Essentials
The Lyrid meteor shower peaks tonight. Don’t miss it!
The best time to watch the Lyrid meteor shower is before dawn on the morning of April 22. You'll have a dark and moonless sky. Good luck!
April 21, 2026
Astronomy Essentials
Meteor showers are here! 10 easy tips for watching
Meteor showers are unpredictable but nothing beats them for a fun and relaxing time under the stars. Here are our 10 tips to optimize your meteor viewing time.
April 21, 2026
Astronomy Essentials
Tonight
Visible planets and night sky guide for April and May
Visible planets and night sky guide. This evening, the crescent moon hangs between between Jupiter and the twin stars of Gemini, Castor and Pollux.
April 21, 2026
Astronomy Essentials
Clusters Nebulae Galaxies
Meet M13, the Great Globular Cluster in Hercules
Many stargazers call it the finest globular cluster in the northern half of the heavens. It's M13, also known as the Great Globular Cluster in Hercules.
April 21, 2026
Earth
Small ants clean larger ants in a surprising twist of nature
Small ants clean larger ants, a researcher has discovered. It's the first known case of interspecies grooming between ants.
April 20, 2026
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