What is a polar vortex?

Polar vertex is a persistent, large-scale, upper-level low-pressure area, less than 1,000 kilometers in diameter, that rotates counter-clockwise at the North Pole and clockwise at the South Pole

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.