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Bullet Cluster - Wikipedia
What is dark matter made of? Galaxy cluster collisions offer clues. - CSMonitor.com
Giant collision created galaxies devoid of dark matter
Dark matter is assumed because galaxies don't rotate via their visible mass. Why can't we infer that gravity isn't consistent over large distances? - Quora
Dark-matter self-interactions are weak – CERN Courier
A Cosmic Collision Could Have Made Two Dark Matter–Less Galaxies - Sky & Telescope - Sky & Telescope
Dark Matter | Experimental Astroparticle and Dark Matter
Potential signs of 'interacting' dark matter | EurekAlert!
A galactic smashup might explain galaxies without dark matter
Galactic Smash-Up Shows Where Dark Matter Goes | WIRED
News CFHT - Dark Matter Core Defies Explanation
Astronomy Without A Telescope - Could Dark Matter Not Matter? - Universe Today
Galaxies and Dark Matter
The Andromeda Galaxy's Dark Matter Matters | Particle
This Is How Galaxy Cluster Collisions Prove The Existence Of Dark Matter
Evidence of broadside collision with a dwarf galaxy discovered in the Milky Way | Penn Today
Dark Core' in Galaxy Cluster May Not Be So Dark After All | Anne's Astronomy News
Failed Dwarf Galaxy Survives Galactic Collision Thanks to Full Dark-Matter Jacket - National Radio Astronomy Observatory
Dark matter isn't interacting with itself after all
Halos of dark matter may not be completely dark after all
This Is How Galaxy Cluster Collisions Prove The Existence Of Dark Matter
Dark matter makes up 80% of the Universe—but where is it all? | Ars Technica
A Clash of Clusters | NASA
