In Java, are enum types inside a class static?

I can't seem to access instance members of the surrounding class from inside an enum, as I could from inside an inner class. Does that mean enums are static? Is there any access to the scope of the surrounding class's instance, or do I have to pass the instance into the enum's method where I need it?

public class Universe {
    public final int theAnswer;
    
    public enum Planet {
        // ...
        EARTH(...);
        // ...
        
        // ... constructor etc.
        
        public int deepThought() {
            // -> "No enclosing instance of type 'Universe' is accessible in this scope"
            return Universe.this.theAnswer;
        }
    }
    
    public Universe(int locallyUniversalAnswer) {
        this.theAnswer = locallyUniversalAnswer;
    }
}

Yes, nested enums are implicitly static.

From the language specification section 8.9:

> Nested enum types are implicitly > static. It is permissable to > explicitly declare a nested enum type > to be static.

It wouldn't make sense to make an instance-level (non-static) inner enum class - if the enum instances were themselves tied to the outer class they'd break the enum guarantee -

e.g. if you had

public class Foo {
   private enum Bar {
        A, B, C;
   } 
}

For the enum values to properly act as constants, (psuedocode, ignoring access restrictions)

Bar b1 = new Foo().A
Bar b2 = new Foo().A

b1 and b2 would have to be the same objects.