Emperor penguins: A report from the Antarctic

EarthSky friend Eliot Herman took a trip to the Antarctic, where he had the opportunity to see emperor penguins. Read his report and enjoy his amazing images.

Oldest known wild bird, Wisdom, is back!

A beloved albatross named Wisdom is the world's oldest known wild bird. She's more than 70! And she just returned again to her winter nesting ground.

What’s a green flash and how can I see one?

Have you ever seen the green flash from a setting sun? Learn how to see one here, plus how they appear, and enjoy some great photos and watch a video!

Einstein’s gravity and quantum mechanics united at last?

Modern physics is founded on 2 pillars: Einstein's gravity and quantum mechanics. But these 2 theories contradict each other. Does this theory reconcile them?

Kelvin-Helmholtz clouds look like ocean waves

Kelvin-Helmholtz clouds - aka billow clouds or shear-gravity clouds - can sometimes look like ocean waves. Check out these photos of them!

Audubon Christmas Bird Count signup has begun

The Audubon Christmas Bird Count, held each winter, is one of the longest-running community science projects. You can help collect important data about birds.

Earth’s magnetic field shields us. But it can move and flip

Earth's magnetic field helps protect life on Earth. But the magnetic poles wander, and they flip polarity every 100,000 to 1,000,000 years.

What moves the sailing stones of Death Valley?

At Death Valley’s Racetrack Playa, the sailing stones show signs of movement, etching trails in the dry lake bed. It was a mystery until quite recently.

How to see Earth’s shadow at sunrise and sunset

Just before sunrise and after sunset, you can spot Earth's shadow. Look west at sunrise and east at sunset. Learn more about Earth's shadow here.

Are some modern earthquakes aftershocks from the 1800s?

Scientists examined modern-day earthquakes in 3 regions of North America and found that some are aftershocks from the 1800s.