The Aral Sea was once the world's 4th-largest lake. But in the 1960s, the Soviet Union diverted 2 major rivers to irrigate farmland, and the Aral Sea has been slowly disappearing ever since.

A study traces black carbon from 1991 Kuwait oil fires to ice in northern Tibet. Researchers say this soot could affect glacier melt at the Tibetan plateau, considered the "Water Tower of Asia."

Astrology and astronomy differ. In some systems of astrology, zodiac signs remain fixed relative to seasonal markers, such as the equinox and solstice points.

Wow! Huge thanks to the EarthSky community for all the images you've contributed this year. Here are some of 2018's most popular photos.

Sure it is, says this physicist, but only if you have an object with infinite mass. Here’s the story of how to build a time machine, with a design that's deceptively simple.

For people in the continental United States, here’s your historic probability of getting a white Christmas in 2018.

According to the recent IPCC Special Report, warming of 1.5°C (2.7°F) is an important threshold for many climate impacts. What might our planet look like with 1.5°C of warming?

Audubon’s annual Christmas Bird Count is one of the longest-running citizen science projects in existence. How to participate.

As far back as 40,000 years ago, cave-dwellers in what's now Turkey, Spain, France and Germany all used a method of date-keeping based on the stars. Some of their cave paintings aren't just depictions of wild animals; instead they represent constellations in the night sky.

Astronomer Wanda Díaz Merced - who began losing her sight in her 20s - presented one of TED’s most-watched astronomy videos. Here's how turning a telescope's digital data into sound can help reveal hidden patterns.