Creationism isn’t.
Young Earth ism is.
Nothing in Scripture demands God created everything within 10,000 years.
Just looking up at night and thinking about what you see demands a universe larger than 10,000 light-year radius (i.e.: what you see can’t fit in a space 20,000 light-years wide).
And just because parts of Pluto are smooth doesn’t detract from other celestial bodies being very much not.
Starlight and Time by Russell Humphreys.