Good Science Fair Project?

This year my school is having a science fair and i don't know wat to do!

I want a unique one unlike "how long does a battery last" or "what paper towel is the strongest"

i want one relating to space

and i dont want one too complicated that costs a lot of money

(oh and dont tell me to make a model of the solar system cuz that is soo first grade)

Update:

and as i said plz dont tell me to make a model

maybe something original?

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