EarthSky

Simulating stars’ sounds to reveal their secrets

“A cello sounds like a cello because of its size and shape,” said astronomer Jacqueline Goldstein. “The vibrations of stars also depend on their size and structure.”

What Mars’ giant dust storm taught us

Before we send people to Mars, we need to understand more about how Martian dust could affect astronauts and their equipment. Here are 3 things we’ve learned from the planet’s 2018 global dust storm.

What’s the birthstone for May?

If you were born in May, your birthstone is the emerald, a type of beryl colored green by chromium. Perfect emeralds are among the rarest of gemstones.

Male emperor penguins are good dads

In fact, they’re one of nature’s best animal dads. This month – autumn in Antarctica – their breeding cycle begins. But there’s still a long winter ahead.

Artist's depiction of 8 human skull fossils.

Human history in your face

When you look in a mirror, the face you see is the result of millions of years of human evolution. Here’s an interview with an expert discussing how and why our modern human faces evolved to look as they do today.

Favorite photos for Earth Day 2019

Here’s a collection of wonderful photos from the EarthSky community in celebration of Earth Day 2019. Thank you all!

Sky chart of moon and planets

Watch for moon, Jupiter, Lyrid meteors

That bright moon in the sky before sunup will drown most of the ongoing Lyrid meteor shower from view. But the moon offers its own delights, sweeping past Jupiter in the next few mornings.

A reptile expert takes your burning dragon questions

As Game of Thrones returns for its final season, a herpetologist addresses some highly fictional dragon scenarios using real science.

Fly with the world’s fastest bird

When in its hunting dive, the Peregrine falcon is the fastest bird – in fact, the fastest animal – on Earth. Get a bird’s-eye view of the flight of this magnificent creature, in this video.

Sky chart of the Big Dipper, Arcturus and Spica

Follow the arc to Arcturus, drive a spike to Spica

If you only ever learn one star mnemonic, make it this one!