Dark matter is completely invisible, but it still obeys the law of gravity, so the existence of dark matter haloes, and their shape, can be inferred by monitoring the orbits of dwarf galaxies orbiting the much larger Milky Way.
?We expected [...]
Full story at http://spacefellowship.com/news/art17783/milky-way-has-beach-ball-dark-matter-halo.html
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