Skepticism and Evidence Gaps in Extraterrestrial Visit Claims

To the point

There's no verified evidence that Earth was visited by aliens; claims rest on David Grusch’s unverified assertions and undisclosed documents, NASA and the DoD deny such programs, independent experts like Joshua Semeter and Adam Frank cite data gaps and hearsay, Leslie Kean and Ralph Blumenthal reported supporters Karl Nell and Jonathan Grey, and even if intelligent life exists, vast distances and physics make visits unlikely, so credible proof would require verifiable recovered spacecraft or biologics.