Enjoying EarthSky? Subscribe.

273,113 subscribers and counting ...

An asteroid exploded over Russia this week

Images and video of the daylight meteor seen over Russia on June 21. The small asteroid exploded in the air; fragments may have reached Earth. Plus … why are so many large meteors seen over Russia?

Why do fireflies light up?

A firefly’s familiar glow is caused by a chemical reaction. Explanation here, plus many wonderful firefly photos.

Will ‘slow earthquakes’ along central San Andreas trigger larger quakes?

“Based on our observations, we believe that seismic hazard in California is something that varies over time and is probably higher than what people have thought up to now.”

It’s summer. What’s noon to you?

What do you mean by noon? Do you define it by your clock or wristwatch? Or the gnawing in your stomach? Here’s how astronomers think about noontime.

More From Latest

All you need to know: June solstice 2018

Happy June solstice! Longest day for the Northern Hemisphere. Shortest day for the Southern Hemisphere. Either way … a good time to celebrate!

Lake Superior sediment-heavy after torrential rains

The downpour took place last weekend in parts of the U.S. Upper Midwest – Wisconsin, Minnesota and especially northern Michigan. Satellite images show the effects on Lake Superior, the largest of the Great Lakes of North America.

Solstice sun on Taurus-Gemini border

On June 21, 2018, at around 21:00 UTC, the sun moves out of Taurus the Bull and into Gemini the Twins. Note that we’re talking about the boundaries of astronomical constellations – not astrological “signs” – of the zodiac.

Mars dust storm grows global

The storm is now officially “planet-encircling.” At Gale Crater, where the Curiosity rover is studying the storm’s effects, dust has starkly increased. Meanwhile, the Opportunity rover stays silent.

10 things about Martian dust storms

Mars’ massive dust storms have been challenging – and enticing – scientists for decades. From NASA, here’s the scoop on Martian dust.

Fossils of 2 new creatures from dawn of animal life

Researchers found the 2 fossils in a South Australian fossil bed dubbed “Alice’s Restaurant Bed,” a tribute to the Arlo Guthrie song lyric “You can get anything you want at Alice’s Restaurant.”

Video: Watching solstices and equinoxes from space

See how sunlight falls on Earth’s surface during the solstices and equinoxes, and get a better understanding of why Earth’s tilt causes the seasons.

Astronomers see a black hole eating a star

Astronomers now have the 1st direct image of a black hole ripping apart a star. The star-stuff goes into a disk surrounding the hole, and it’s also ejected back to space in powerful jets.

Tick’s worst day ever preserved 100 million years

A bit of amber preserved a drama from 100 million years ago, an interaction between a tick and a spider.