Illustration of an astronaut floating in a dark sky with a dark blue whirlpool in the background.

Rotating black holes as portals for hyperspace travel

One of the most cherished science fiction scenarios is using a black hole as a portal to another dimension or time or universe. Is it possible? Maybe. But choose carefully. All black holes are not created equal.

The shrinking Aral Sea

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.

Horseback rider crosses a yellow plain, in front of a snow-covered mountain .

Black carbon from Gulf War shows up in Tibet glacier

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.”

What’s a Blood Moon?

The upcoming total lunar eclipse on the night of January 20-21 is being called a Blood Moon eclipse. Why? Here’s the reason.

What is the zodiac?

Maybe you associate the word ‘zodiac’ with astrology, but it has an honored place in astronomy, too. It’s defined by the annual path of the sun across our sky.

When does the Age of Aquarius begin?

Astronomers and astrologers may agree that the Age of Aquarius starts when the vernal equinox point moves out of constellation Pisces and into Aquarius. But when will that be? There’s no definitive answer.

Sun’s entry into zodiac signs, 2019

Astrology and astronomy are different systems. In some systems of astrology, signs of the zodiac remain fixed relative to seasonal markers, such as the equinox and solstice points on the sky’s dome.

How many supermoons in 2019?

We’ll have a series of 3 full supermoons on January 21, February 19 and March 21, 2019. Of these, the February 19 full moon will be the closest and largest full supermoon of 2019.

New Year's Eve fireworks in Singapore 2019.

Why the New Year begins on January 1

Celebrating the New Year on January 1 is a civil event, not an astronomical one. And yet nature cooperates to make January 1 a satisfying time to start anew.

EarthSky’s most popular photos of 2018

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.

2019 EarthSky Fundraiser

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