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Constellations
Leo the Lion and its easy to see backward question mark
Leo the Lion - one of the zodiacal constellations - is a prominent fixture from April through June in the evening sky. It’s easy to spot by finding the Sickle.
April 24, 2026
Today's Image
The Trifid Nebula highlights Hubble’s 36 anniversary
It's the Hubble Space Telescope's 36th anniversary! To celebrate, NASA has released an image of the iconic Trifid Nebula. Watch a video here.
April 24, 2026
Astronomy Essentials
Tonight
Visible planets and night sky guide for April and May
Visible planets and night sky guide. The waxing gibbous moon shines high in the sky near the Sickle in Leo the Lion, close to the bright star Regulus.
April 24, 2026
Earth
Human World
Join the worldwide 2026 City Nature Challenge this weekend!
This weekend, April 24-27, 2026, join the global City Nature Challenge and record the biosphere in your neighborhood to help track real-time change.
April 24, 2026
Space
Milky Way’s ‘ultra-faint dwarf galaxies’ help probe early universe
Ultra-faint dwarf galaxies preserve clues to early-universe conditions, acting as cosmic fossils. Simulations show whether they formed stars or stayed dark.
April 23, 2026
Earth
Space
Waves on other planets vary widely, new MIT study suggests
A new study from MIT suggests that waves on other planets should vary greatly. Scientists are looking at the lakes and seas of Saturn's moon Titan for clues.
April 23, 2026
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: Surprise! The sun blasts 2 X flares!
Sun news for April 24, 2026: Surprise! Two X flares over the past day! Both came from active region AR4419, which soon will rotate out of view.
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
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