To rewrite \( 9^{-23} \) with positive exponents, we can use the property of negative integer exponents, which states that:
\[ a^{-n} = \frac{1}{a^n} \]
Applying this property to \( 9^{-23} \):
\[ 9^{-23} = \frac{1}{9^{23}} \]
So, the expression \( 9^{-23} \) rewritten with positive exponents only is:
\[ \frac{1}{9^{23}} \]