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.

The newly discovered interstellar object 3I/ATLAS could be a piece of "possibly hostile" extraterrestrial technology in disguise, according to controversial research from a small group of scientists, ...

A strange interstellar object is hurtling its way toward our pale blue dot — and according to a Harvard astronomer, there's a chance it's not a benign asteroid or comet, but instead some harmful form ...

Instead of some far-off galaxy, a new paper suggests extraterrestrial life might come from underground. The piece, written by researchers from Harvard and Montana Technological University, suggests ...

Some people will look at this thing and go: “It’s a comet.” Others will look at it and go: “It’s alien technology.” According to ScienceAlert, it was July 1 when astronomers clocked a strange, ...

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To explore the galaxy and hunt for resources, intelligent aliens might need to turn their home stars into natural spaceships, a new paper suggests. A few known star systems might fit the bill. An ...