
Tom C. answered 08/11/20
Patient Certified History/ELD Teacher| Secondary/Middle
Hi,
There are certainly no reliable primary or secondary sources that suggest to us that humans have been in contact with, or have exchanged technologies with extraterrestrials.
There are plenty of conspiracy theories that suggest it happened, but these are almost always based on unverified sources, or snippets of sources that are taken out of context.
It is still a possibility that the building blocks of life came to Earth through extraterrestrial means, such as organisms on asteroids etc. But I think that is a different discussion.
So in short - The answer is no.