Enjoying EarthSky? Subscribe.

245,286 subscribers and counting ...

Full braking at Alpha Centauri

Space visionaries might have figured out a way to travel within decades to the nearest star system, Alpha Centauri. But, once we get there, how do we slow down?

What’s a Blood Moon?

Nowadays, 4 totally eclipsed moons in a row are called Blood Moons. Why? We don’t know for sure, but the answer may lie in a 2013 book by 2 Christian pastors.

Sky solution to help endangered species

An astrophysicist and an ecologist are combining their expertise using drones, thermal cameras and the techniques used to analyse objects in space in order to help endangered species.

Northern U.S. meteor dazzles thousands

Early Monday morning, thousands of people across multiple northern U.S. states watched a brilliant meteor streak across the sky. It then plunged into Lake Michigan.

Today in science: Great Meteor Procession

The February 9, 1913 meteors crossed the sky in formation, on nearly identical paths. Their pace across the sky was described as “stately” and “measured.”

Groundhog Day has roots in astronomy

Groundhog Day is tied to the movement of Earth around the sun. It’s the year’s first “cross-quarter” day.

February birthstone is the amethyst

Are you a February baby? Here’s some cool info about your birthstone, the amethyst. Plus pics!

Today in science: Launch of Explorer 1

Launched on January 31, 1958, it was the 1st American satellite and 1st satellite to measure the environment of near-Earth space.

Astronomy statement on US travel ban

The International Astronomical Union issued a statement on Monday in response to the U.S. executive order limiting travel from 7 countries. Read it here.

Shark attacks drop to average in 2016

After 2015’s record year, 2016 saw fewer shark attacks worldwide. Here in the U.S., the most happened in Florida.