Step 1: You will need
2 different sizes of styrene form balls
3 crochet hook
and
scissors, craft glue, needle...

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This project is cool and usung the relative distances between planets is really nice and a good way to talk astronomy without seeming pedantic but read up a bit so you know your basic solar system facts.
A super project is a public walk with planets starting with the Earth as pepper corn size, http://www.noao.edu/education/peppercorn/pcmain.html or one walkable in 8 minutes (the time it takes light to travel the range of our system), http://anchorageplanetwalk.org/
Good work!
Gabh an latha,
Richard
I'll check these up :)
Ciao
A.