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so what is dark matter? galaxys like our own milky way are held together by gravity. the force comes from everything that s in them. the stars, the planets, the dust. all of this material doesn t provide enough gravity to stop these great spirals from flying apart. there s something else there. a cosmic glue that we can t see that adds the extra gravity to bind them together. and that s dark matter. and what about the other missing parts of the cosmos? dark energy. since the big bang, the universe has been expanding, with galaxies moving ever further apart. scientists had thought that over time this would slow down. but actually this expansion is speeding up. and it s thought that a mysterious force, dark energy, is driving this. it could enormously influence the fate of our universe. how far is it going to expand?