A Soviet astronomer in the 1960s proposed a scale to classify hypothetical alien civilizations. Here’s why the framework is ...

A planet with one side permanently roasting and the other frozen in endless darkness might still have a chance of supporting life. Researchers found that heat inside a tidally locked exoplanet could ...

If humans vanished, evolution might not crown another primate. One unlikely marine predator has the brain, dexterity, and ...

The search for life beyond Earth has always been full of surprises. Strange radio signals have sparked excitement. Odd gases on distant worlds have raised questions. Even ordinary objects have been ...

When it comes to the search for life elsewhere in the universe, methane and other chemical compounds are seen as signs of ...

Teetering near endangered status, the starlet sea anemone produces “an ancient mechanism” for fighting viruses that ...

The idea that octopuses might be aliens emerged from the theory of panspermia (Stelele 2018), according to which life on Earth is not entirely of terrestrial ...

In the book version of “Project Hail Mary,” author Andy Weir, known for grounding his fiction in plausible science, describes ...

A mind wrapped in skin and bone can feel like the obvious model for consciousness. But that assumption may say more about where you live than about what consciousness really requires.

The planets are extremely large, with TOI-791 b being about the same size as Jupiter, and TOI-791 c even larger. Yet, they are so light that NASA compares them to cotton candy planets because of their ...

A strange interstellar comet discovered last year and speculated by a prominent astronomer to be an alien spacecraft could be older than our Solar System, according to a new study. The comet, first ...

With the release of Disclosure Day, Steven Spielberg’s new film about aliens, a question as old as science fiction itself resurfaces: if aliens were to arrive on Earth, would they come to conquer us, ...