[js1138]

On what basis was Galileo placed under house arrest? What was his crime?

[DarkSavant]

I answered your question, but I'll reiterate it. Heresy. Teaching as fact something contrary to the current interpretation of scripture that he couldn't prove. Like I stated already, he was allowed to treat it as a workable hypothesis(which it was at this time) but that wasn't good enough for him. He tried to strongarm the Church to accept Copernicus(a very bad move).