First off, hello! It's nice to meet you! I was actually hoping potential appers would swing by with questions, so this is a little exciting for me.

This is actually not a problem! The S.S. Thor is a refugee-gathering ship, meaning it has vaguely explained technology (probably something to do with wormholes, since arrivals come from drastically different points of time and space) which will pick up characters straight off their home world and bring them right to the Arrivals section of the Thor. Characters are typically not even aware of their planet's destruction until the Vogon at the desk tells them about it.

However, if you have a more creative idea on how you would like your character to arrive on the Thor, go for it! I've personally had a character who was discovered on one of the planets that the ship was visiting, and I know that many who were enabled by our fourth wall event simply assumed their character transferred ships.

Let me know if you have any other questions!