Scientists have found new evidence suggesting that interstellar 3I/ATLAS is not an alien spaceship, as one conspiracy theory claims, but a comet.

A mysterious cigar-shaped object spotted tumbling through our solar system last year may have been an alien spacecraft sent to investigate Earth, astronomers from Harvard University have suggested.

Is 3I/Atlas an interstellar alien vessel or simply an intriguing, unique rock hurling through the cosmos? That debate has been raging ever since the comet, only the third known interstellar object to ...

When astronomers first spotted the fast-moving object 3I/ATLAS hurtling through the solar system in July 2025, speculation erupted online: was it another ʻOumuamua—or even an alien craft? Months of ...

NASA has quietly hit pause on what it billed as its first dedicated hunt for alien biosignatures, reacting to fresh data that raised more questions than answers about how to tell life’s fingerprints ...