A huge invisible mass could be the reason the Milky Way's disk is warped and twisted.
However, none of the explanations proposed to date have explained both the warp and the flare, according to Han and his colleagues, astronomer Charlie Conroy and astrophysicist Lars Henquist, both also of CfA.
So they conducted some simulations and modeling to see if they could reproduce the observed shape of the Milky Way, warp, flare, and all.
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