Alidar Jarok wrote:

Also, I'm not sure there's a Galactic version of the internet in this universe where information can travel that freely and anonymously.
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The HoloNet was pretty open under the Old Republic (and later would be again under the New Republic / Galactic Alliance), but large portions of it were taken offline after Palpatine took power as Emperor and what remained after that was strictly controlled.
Alidar Jarok wrote:

Well, Han probably believes that the Jedi existed and were really good at using lightsabers, but he had no reason to believe they had special powers. I don't think Chewie saw Yoda do necessarily changed that.really good, but didn't know they had
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Also, perhaps Chewie never talked to Han about his experience in the Clone Wars. Chewie was already 200 years old by the time of Yavin, so that's a pretty lengthy lifespan of numerous possible stories.