Astronomers have discovered a bizarre lemon-shaped exoplanet orbiting a dense, rapidly spinning dead star. But those details are perhaps the least weird thing about it. Using the James Webb Space ...

Temperature stress may be driving genetic mutations in polar bears in southern Greenland, a new study reports. The species is struggling in the face of a changing global climate. Global sea ice levels ...

The audio version of this article is generated by AI-based technology. Mispronunciations can occur. We are working with our partners to continually review and improve the results. Mark Nikiforov says ...

In just a few days, an enigma from the far reaches of the cosmos will make its closest approach to Earth, offering a final, fleeting glimpse before it vanishes into the void forever. The visitor is 3I ...

A red quarter of a circle with the words 'The Quarter Mark' beside it. A year-long series looking back on the most significant moments of the past 25 years, how they changed our world, and how they ...

Here’s how to keep your 3I on it. With 3I/ATLAS slated to make its Earth tour in two days, amateur photographers and astronomers alike are scrambling to catch sight of the interstellar comet. Our ...

This may be the best time to see this celestial visitor before it is gone forever. Interstellar comet 3I/ATLAS reached its closest distance to Earth on December 19, and this is our last, best chance ...

Comet 3I/ATLAS is set to make its closest approach to Earth in December 2025. This comet, discovered in 2025, is known for its bright nucleus and distinctive tail, visible even from urban areas with ...

A quiet messenger from the farthest reaches of the Milky Way is making its last, dramatic appearance on this day, December 19, 2025. The interstellar comet 3I/ATLAS, which is a frozen remnant from the ...

Astronomers using the James Webb Space Telescope (JWST) may have discovered the most distant supernova in the universe. This stellar explosion, hosted by a very faint galaxy, occurred when the ...

December’s ‘Cold Moon’ supermoon was the last full moon of 2025, and on January 3 the ‘Wolf Moon’ will rise as the first full moon and supermoon of 2026. The moon is one of nature's wonders, but to ...