Answer :
Temperature lower than absolute zero is not possible. Lower than absolute zero a gas contain negative pressure and volume which is not possible. temperature is the energy created by moving atoms absolute zero is a complete stand still you can make particles move to the end of the universe but the coldest temperature will be stuck at the point where atoms are motionless
hope that helped :)
because there is no such thing as cold, so you cant get colder because the molocules are already still and there is absolutly no heat