It is sometimes said that the universe is homogeneous and isotropic. What is meant by each of these descriptions? Are they mutually exclusive, or does one require the other? And what implications rise because of this?


Question: What do you call a group of people that move a lot?
Answer: I voted up "nomadic" because it is probably the best word to use. However, if we are asking about English as it is commonly used, I have most often heard the word "gypsy" used for that type of person. 

The problem is that this is the name of an actual group of people in Europe, and thus the term is somewhat racist. Oddly, it mostly lost its negative connotations here in the USA, but I suspect that isn't the case the closer you get to their homeland in Eastern Europe.

Anyway, if you are talking about an actual culture of people (as it looks like you are), calling them "gypsies" when they aren't actually ethnic gypsies would be very confusing.