There are some credible arguments that Oumuamua is alien technology.I'd heard an argument recently that we've been to Mars several times, but never with humans stepping foot on the red planet. Similarly, it would make sense that we would be visited by unpiloted drones that are collecting data. And without pilots, an autonomous vehicle is not limited by the biology of its creator - g forces, lifespan, life support requirements, etc. It's only limited by the properties of the materials.
Astronomer Avi Loeb Says Aliens Have Visited, and He's Not Kidding
In conversation, the Harvard University professor explains his shocking hypothesis—and calls out what he sees as a crisis in science