Sunspot regions: Observers tracked 4 numbered regions on the disk, including 2 newcomers. AR4545 (beta): This region grew slightly during the period. It was the most active spot group, producing 5 ...

Saturn at opposition. Earth flies between the sun and Saturn on October 4, 2026. Our motion brings Saturn to its brightest and closest for the year. EarthSky’s Deborah Byrd wants to tell you how to ...

LHS 1140b is a potentially rocky exoplanet in its star’s habitable zone. It’s an intriguing target in the search for worlds ...

One Earth. One Sky. EarthSky. Subscribe ...

An alien radio signal from K2-155 d? Are there any alien civilizations out there? For several decades, scientists have been searching for evidence that they exist. That effort is collectively known as ...

The changes in temperature and vertical structure of the atmosphere are the two main processes that affect the weather on ...

The Komodo dragon ( Varanus komodoensis) is the largest living lizard on Earth. The biggest males can exceed 10 feet (3 ...

In 2020, NASA and the U.S. Department of State led an effort to establish guidelines for human expansion into space. Working with international partners, they came up with the Artemis Accords. NASA ...

Artist’s concept of a future moon base. A new study suggests there would be enough water on the moon for smaller bases, villages or towns, but not larger cities. Image via ESA. Elvis and fellow ...

A member of the newly discovered tiger cat species — Leopardus tilcayo — at La Senda Verde, a private wildlife refuge in the Yungas region of Bolivia. This little cat, a male, was previously kept by a ...

Sometime between April 11 and May 22, 2024, a comet or asteroid the size of a 3- to 6-story building hit the moon. But we didn’t know about it until someone scanning Lunar Reconnaissance Orbiter maps ...

Microscopic bits of alien tech on the moon? As scientists searched for intelligent extraterrestrial life — i.e., aliens — they’ve focused on a short list of standard possibilities. In other words, ...