( she starts to say something and then stops, needing a minute, she'd just about managed to be accepting of the fact that they were pulled into a new world (she could see that so it wasn't hard to understand) but parallel earths? not something that's crossed her mind before )

My Earth doesn't have magic, yours does and... there are probably Earths where people have been into space.

( assuming, but given her conversation with merrin she has to assume that earth exists there. whether or not people from earth did go to space or not )

Okay... ( slowly letting that sink in ) How does something like magic stay a secret?

( since not everyone knew )