There doesn't seem to be a specific definition for "tyui." It might be a typographical error or a typo. If you can provide more context, I'll do my best to help you with the information you're looking for.
tyui
Secondary succession
In a standard month (I.e, 30 days) of Sundays, there would be 210 days. So, long but not forever.
The Espionge and sedition acts were made to keep Americans from having their freedom of speech. Pretty much the government was in control and there was no more being called an "American" because being an American meant that you would have civil liberties.
Far enough from the new Sun that they did not "evaporate". In other words, towards the outer rim of the main part of the disk.