Katie is very particular. she likes her apartment to be overly organized and things have to be done correctly or she gets upset. according to psychodynamic theory, katie is most likely fixated at the phase of psychosexual development.

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.