Size of Objects in entanglement Pardon the possible obviousness of my lack of understanding entanglement but how big have we noticed the objects in the system whole? We talking particles or can planets or universes be entangled?
Thanks for any advice.
 A: There is nothing that forces things to become unentangled if they get large.
In fact if two particles are entangled, then any system that contains those particles is also entangled. Its normal to be entangled.
A: For some insight into the current state of the art with meso- and macroscopic entangled objects you may want to take a look at "Entangled mirrors could 'reflect' quantum gravity" (APS Synopsis link). The proposal envisions "entanglement of mirrors weighing as much as 100 grams", or the size of good apples, as the article points out. It seems the technology is available and the applications worthy.   
A: 
how big have we noticed the objects in the system whole? We talking particles or can planets or universes be entangled

The term "entangled" is a short hand way of saying "a  mathematical wavefunction  (a solution of the quantum mechanical equation for the system), describes the behavior of the system". Example  the Hydrogen atom : the electron and the proton are entangled.
In theory the whole world can be defined with a wave function that has everything entangled. BUT our measurements have accuracies and measurement errors. The classical domain emerges when within our measurement errors we cannot see any entanglement. This is described by the density matrix  where entanglement is seen in the off diagonal elements. When these elements become equivalent to zero within our accuracies, then the system behaves classically and entanglement can be ignored. This happens most of the time when h_bar is effectively 0,  the Heisenberg Uncertainty is irrelevant, all observables commute . h_bar is of order 10^-34 jouleseconds, a very small number, so sizes are small and the effects start to be seen in nano dimensions ( hence nano technology).
BUT there are exceptions where quantum mechanical order/entanglement appears macroscopically: lasers,  superconductivity, the order in crystals , superfluidity. Superconductivity can extend quantum mechanical effects ( and thus entanglement)to kilometers. 
