Lord Freddie wrote:Sponge balls could be planets.
D'lites could be used to fit a space theme...
When I read the original post, both of these came to mind, in partcular Jay Scott Berry's wonderful
Magic of the Spheres routine:
http://www.youtube.com/watch?v=_ktMTfxarEcWhich you don't really have time to learn, sadly. Perhaps you can come up with something similar based on what you already do.
You can also get sponge stars (I think the yellow ones look a lot better than the red), which might suit a regular sponge routine you do.
What you might have time to buy and learn is Phil Goldstein's
Procket (which sounds like it could use a visit to innuendo bingo).
This is a quick packet routine involving four picture cards. One shows a rocket ship; it's dealt to the table. The others bear the numerals for a countdown, and the cards are dealt as the performer calls out, "Three, two, one... blast off!!" With this final exclamation, the initial card is turned up, and the rocket is gone, replaced by an explosion denoting its magical departure! The best part is that the rocket is then reproduced from the magician's pocket!
Something else that occurred to me is a rising card effect, representing a rocket taking off, maybe with a card you've drawn a rocket on (bearing in mind the audience age). You could also simulate a rocket launch with something like the
Silver Sceptre.
I am not sure how good six year olds are on the concept of gravity. Obviously, they will know things fall down when dropped, but I am not sure if they'd grasp that the moon has less gravity than the earth, or that things float in space. If it is appropriate, then you've also got levitations and other anti-gravity tricks.