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Dancing Galaxies

The larger galaxy on the right is seen nearly face-on, with a giant arm of stars, dust and gas reaching out and around its smaller neighbour, which is viewed edge-on.

The shapes of both galaxies have been distorted by their gravitational interaction with one another.

The pair are known collectively as Arp 87, and are just one celestial coupling among hundreds of interacting and merging galaxies known in the nearby universe.

Link

It's pretty to an outside observer far far away. But it must suck for anyone living in either of these 2 galaxies. Imagine your planet and sun and stars constantly being shifted and new ones being added. If they're lucky, it happens so slowly that they're able to adapt to the changes. But if not, imagine the havoc the changing gravitation pulls would wreak on a planet.