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Space
How much water on exoplanets does life need?
Astronomers think water is essential to life as we know it. So how much water on exoplanets does life need? A new study suggests 20-50% of Earth's water.
April 23, 2026
Sun
Sun news: Sun activity jumps with three M flares!
Sun news for April 23, 2026: Three M flares rocked the sun this morning! Each fired sun-stuff into space, which forecasters are now analyzing.
Astronomy Essentials
Tonight
Visible planets and night sky guide for April and May
Visible planets and night sky guide. Tomorrow, look for the half-lit 1st quarter moon. It'll rise about noon and be high in the sky at sundown.
April 23, 2026
Astronomy Essentials
Here’s how to see the Lunar X and V at 1st-quarter moon
Lunar X and Lunar V are optical features on the moon. They are visible through a telescope for several hours around the time of the 1st quarter moon.
April 23, 2026
Space
See great pics of Comet R3 PanSTARRS from our community
Comet R3 PanSTARRS is now too close to the sun to see. But enjoy these fantastic photos from the EarthSky community of when it was in the morning sky.
April 23, 2026
Earth
Lights out for birds during spring migration!
Turn the lights out for birds during spring migration. And check out the links here to maps that show when birds are passing over the area where you live.
April 22, 2026
Space
Black hole Cygnus X-1 has fast, powerful dancing jets
The Cygnus X-1 black hole emits jets that are bent by stellar winds from a companion star. This has enabled astronomers to calculate the power of those jets.
April 22, 2026
Space
Summer solstice in Mars’ southern hemisphere is April 25
The summer solstice in Mars' southern hemisphere happens on April 25, 2026. Summertime there typically kicks off dust season on the red planet.
April 22, 2026
Earth
Human World
Happy Earth Day! Why do we celebrate it 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! 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
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