The sumerians were a people who made up one of the world's first civilizations. they are usually credited with being the first to develop one of the earliest known forms of

What happens when two galaxies approach each other? a. they form a black hole. b. they merge because of the strong gravitational pull they exert on each other. c. they shred each other into smaller galaxies. d. they form a supernova. e. they repel each other away because of their strong gravitational pull.