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The ancient alien theory sounded possible - until the missing evidence became impossible to ignore

What if an alien civilization did not just exist somewhere in the universe, but actually reached Earth in the distant past?

Could aliens ever visit Earth? An aerospace scientist unpacks the challenges of interstellar spaceflight

To travel between solar systems, a spacecraft would need extremely sophisticated – if not impossible – technology.

Scientists probe cosmic visitor from deep space, come up empty in search for alien life

The object, called 3I/ATLAS, is only the third interstellar visitor ever detected passing through our Solar System.