The Ends of the Trail, Where the Dark Matter Presumably Remains

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The two objects that originally collided should still be out there in these scenarias, but they should be incredibly dark. And when we looked at the ends of the trail, there are actually two galaxieso one on each end. Thay are very unusual, an interest. They're very big, very fluffy, and one of them in particular is extremely faint. It's one of the faintest galaxies ever discovered. That will be extremely exciting if we can show that this is where all the massis"

00:47 The mystery of the missing dark matter

Dark matter makes up most of the matter in the Universe, and is thought to be needed for galaxies to form. But four years ago, astronomers made a perplexing, and controversial discovery: two galaxies seemingly devoid of dark matter. This week the team suggests that a cosmic collision may explain how these, and a string of other dark-matter-free galaxies, could have formed.

Research article: van Dokkum et al.

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20:46 Imaging the black hole at the centre of the Milky Way

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