What are we talking about?
Extraterrestrial material? Already have some (meteorites, moon/asteroid samples, etc.)
Extraterrestrial crewed craft? Very highly unlikely
Extraterrestrial robotic craft? Somewhat less very highly unlikely
Hiding the fact-of may be useful to governments, of course;
but I think that this ambiguity is be even more valuable to Hollywood
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• Story
Every time there’s a breaking revelation about a new Biden family crime, UFO’s and aliens hit the news to take the headlines. Happens like clockwork.
^No surprise. Every time SloJoe flubs a teleprompter cue or stumbles somewhere, I think “Well, there’s still a bug in the Obamaton program.”