During story time tonight, Z chose a book from the library about asteroids and comets. The section we read specifically addressed the likelihood of the earth being pummeled and destroyed by an earth-crushing blow from a several-mile wide space rock.
Me (reading): "...some of these asteroids can be several miles wide."
A: Is that real?
Me: "Some of them have come much closer to the earth than the moon."
A: That's not real.
Me: Yes, it is.
A: I don't think so. Closer than the moon? Not real.