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Space
Mars’ interior might contain remnants of baby planets
A new study of seismic data from marsquakes shows that Mars' interior is lumpy. The debris, deep in the mantle, came from large impacts billions of years ago.
September 4, 2025
Astronomy Essentials
Tonight
Visible planets and night sky guide for September
Visible planets and night sky guide. This weekend's full moon is a Blood Moon. That's because a total lunar eclipse is happening on September 7! Watch a video.
Astronomy Essentials
Why is there no eclipse every full and new moon?
If the moon orbited Earth on the same plane that Earth circles the sun, we'd have an eclipse at every full and new moon. Here's why we don't.
September 4, 2025
Sun
It’s aurora season. Why more auroras at equinoxes?
There's an aurora season around the equinoxes, due to the way the magnetic fields of the sun and the Earth work in conjunction with sun-Earth geometry.
September 4, 2025
Earth
Sun
Sun news: Almost-M flare fires out sun-stuff
Sun news September 4, 2025. Solar activity nearly reached moderate levels this morning, as AR4207 erupted with a C9.2 flare that sent ejecta into space.
September 4, 2025
Earth
Bizarre ankylosaur with spikes is unlike any known dinosaur
Spicomellus afer, an early ankylosaur found in Morocco, had bizarre spikes all over its body. Those around its neck reach over 3 feet (1 meter) in length.
September 3, 2025
Today's Image
Butterfly nebula offers clues on how Earth-like planets form
New observations of the Butterfly nebula reveal a dust torus, energetic jets, and PAH formation, providing insight into how rocky planets like Earth assemble.
September 3, 2025
Astronomy Essentials
The 2nd eclipse season of 2025 starts this week
One of the many noticeable cycles in the heavens is an eclipse season. The 2nd eclipse season of 2025 starts with a total lunar eclipse on September 7, 2025.
September 3, 2025
Astronomy Essentials
Why isn’t the Harvest Moon in September this year?
Why isn't September's full moon the Harvest Moon this year? The Harvest Moon is often in September, but not always. This year it's in October. Read more.
September 3, 2025
Today's Image
See the best deep-sky photos of August 2025 here
Enjoy this gallery of deep-sky photos for August 2025 from our EarthSky community. If you have a great photo to share, send it in, too. We love to see them!
September 3, 2025
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