Dark matter may not be part of a "dark sector" of particles that mirrors regular matter, as some theories suggest, say scientists studying collisions of galaxy clusters
When clusters of galaxies collide, the hot gas that fills the space between the stars in those galaxies also collides and splatters in all directions with a motion akin to splashes of waterDark matter makes up about 90% of the matter in galaxy clusters: Does it splatter like water as well?
New research suggests that no, dark matter does not splatter when clusters of galaxies collide, and this finding limits the kinds of particles that can make up dark matter. Specifically, the authors of the new research say it is unlikely that dark matter is part of an entire "dark sector" — a mirror version of the visible universe. Read more...
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