Astronomy Essentials
Meteors in moonlight: 6 tips for 2024’s Lyrids
Meteors in moonlight. It's not optimal, but it happens! Here's how to minimize the moon and optimize the Lyrid meteor shower in 2024.
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 2024 is "Planet vs. Plastics."

Comet Pons-Brooks closest to the sun on April 21

Comet Pons-Brooks makes its closest pass by the sun on April 21. Look for it after sunset in the west; it will soon slip into southern skies.

The cicadas are coming! The cicadas are coming!

The first cicadas are starting to emerge this spring, with trillions more on the way. Cicadas may be loud, but they're basically harmless.
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?
Brightest Stars

Sun news April 21: Meet our sun-observing spacecraft

April 21, 2024, sun news. Sun activity is low. No Earth-directed CMEs. Meet the sun-observing spacecraft that provide our daily images!
Astronomy Essentials

Visible planets and night sky guide for April

Visible planets and star guide for April 2024. Lyrid meteors, reaching their peak, make a showing before dawn April 21 and April 22.

Is alien life purple? Researchers look beyond Earth’s green

Is alien life purple? Researchers from Cornell University think that as far as alien worlds go, purple may be the new green.

U.S. wildfire season outlook suggests a slow start

The wildfire season forecast is out. Learn what regions have a higher risk and which ones have a lower risk for April to July 2024. Maps here.
Astronomy Essentials

Why does the moon seem to follow me when I’m in a car?

Here's something you - or your kids - might have noticed: When you're in a moving car, earthly objects get left behind, but the moon seems to follow. Why?

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