What happens when the largest objects meet their twins? (Synopsis)

“Art has a double face, of expression and illusion, just like science has a double face: the reality of error and the phantom of truth.” –Publilius Syrus

Out in the depths of space, objects range from the incredibly small and low mass to the huge and super-heavy, shrinking down again for the most ultra-massive objects in the Universe.

Image credit: The Antiope Doublet asteroid / ESO, via http://www.eso.org/public/images/eso0718b/.
Image credit: The Antiope Doublet asteroid / ESO, via http://www.eso.org/public/images/eso0718b/.

But what would happen, on all scales, if you took two such identical objects and merged them together?

Image credit: NASA.
Image credit: NASA.

Find out what happens when the largest objects meet their twins!