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.

Breathtaking space images inspire us. But what if you couldn't see them? Amelia Ortiz Gil explains how tactile models of the constellations, moon and planets can give people - blind or sighted - a better appreciation of the universe.

Signals from Mars will take 8 minutes to travel to Earth on Monday. By the time we hear that InSight has reached the top of Mars' atmosphere, the lander will have already touched down safely ... or crashed.