Since, I think, the first moon landings, when we started quarantining all the astronauts involved, lest they'd become infected with some strange alien virus.
“Since, I think, the first moon landings...”
Hah...they’ve fooled you too.
Mankind has never stepped foot on the moon. That was all faked on a backstage in Hollywood.
I saw the movie about that.
And NASA already knew that there were aliens doing extensive mining operations on the dark side.
[/mostly sarcasm]