The possibility remains, certainly, but how are we to know. Evidence is shaky at best.
Sometimes science is a joke, though. Some scientists ignore evidence that doesn't fit into the current world view, so the scientific view has a hard time changing because of ego -- not science!
One geo-archaeologist in Texas refused to accept evidence of extremely old human artifacts at Valsequillo, Mexico. He didn't care what the evidence might be. Other scientists merely ridicule those who question the status quo. Science by ignorance, blindness and ridicule. Alas! It happens more often than most realize.
Take the "Clovis first" dogma as another example. Careers were threatened if someone dug below the Clovis horizon where dangerous, contrary evidence might be found.
Ego cripples nearly every activity of man. That's why angels (aliens?) have helped some of us to stay spiritual so that civilization could persist beyond the action-reaction egotism of dog-eat-dog self-concern.