I just read today's xkcd "what if" episode How much Force power can Yoda output?.
In there, it is said that the biggest display of Force power is made by Yoda when he lifts the X-Wing out of the swamp in Dagobah. The article only takes into account the original trilogy, though.
I would be very interested in what the Force really could achieve at a maximum level. I remember, for example, that in Star Wars The Force Unleashed you stop an entire spaceship (an Imperial Star Destroyer in fact!) from falling down on you.
So what is the biggest display of the Force in the Star Wars universe?
I know this question might be closely related to Who is the most powerful user of the Force?, but that one has more of a different angle, as it asked for the person that theoretically would be strongest instead of an actual display of the Force.