Without other planets circling around their heads, confusing me much

[Edwar12345]

the dialogue is as below:

Cory:
Well, I guess because I didn't know how to tell you. I'm not ready to go out on a date yet.

Topanga:
That's ok. Jedediah and Chloe have always told me: "Listen to your inner voice. It'll let you know what is true for you."

Cory:
Yeah, my parents said that too. Only they said it without other planets circling around their heads.

-------------------------------------------------
My question:
the last sentence "Only they said it without other planets circling around their heads." confused me very much, it can't be translate or understood literally, isn't it?

what does "planets" here mean?

PS:
Here is the URL for the dialogue:
http://www.tesoon.com/english/htm/1563.htm

I'm edwar

[Mister Micawber]

.
I suppose that the whole phrase, 'other planets circling around their heads' is meant to suggest that the person having them is spacy [stupefied by (or as if by) some narcotic drug] or otherworldly [Of, relating to, or characteristic of another world, especially a mystical or transcendental world].
.
_________________
Native English teacher at Mister Micawber's

[Edwar12345]

[Mister Micawber]

.