What sort of evidence would we need to justifiably claim that intelligent life from another planet had visited Earth in the distant past and interacted with human ancestors?

Evaluate these claims. Are they reasonable? Why or why not?
1. Jane has lived in her house for 10 years and has just started to see ghosts. She also just started to read horror novels. Therefore, the ghosts must be a figment of her imagination.
2. In order to prove that levitation is real, you have to believe in it. Because unless you think it’s true, you won’t get convincing evidence.
3. Reincarnation is a fact because every person has actually been through many lifetimes.
4. Professor Smith came up with that theory while on LSD. How can anyone take it seriously?
5. Scientists won’t accept a paranormal claim because it conflicts with their preconceived notions that all that exists is matter in motion.
Write a short (5-10 sentence) response to the following prompt:
6. What sort of evidence would we need to justifiably claim that intelligent life from another planet had visited Earth in the distant past and interacted with human ancestors?