Anyone with actual proofs, I think. We have to filter the source according to the type of information: a political tabloid isn't a good source of information fo

Anyone with actual proofs, I think. We have to filter the source according to the type of information: a political tabloid isn't a good source of information for science, even if someone post it on HN. An accredited scientific journal is a good source. Furthermore, it's necessary looking for "red flags" in our source (critical reading): if the source has few verifiable facts or no verifiable fact at all, maybe it's a case of "alternative fact" (aka bullshit). The search for alien life is taken seriously by the scientific community and a researcher has all the motivations to be part of the history proving the existence of extraterrestrial intelligence. If you ask me, I am "probabilist", I think that they could be out there. I'm waiting for evidences. This article is not.