<p>This is what it looks like when 72 galaxy clusters collide. The image, made by combining an x-ray view with visible light data, isn't just a pretty picture: Researchers use images like this to study how <a href="http://news.nationalgeographic.com/2015/03/150313-dark-matter-galaxy-mystery-space-gamma-ray-astronomy/">dark matter</a> interacts with itself.</p>

Dark Collisions

This is what it looks like when 72 galaxy clusters collide. The image, made by combining an x-ray view with visible light data, isn't just a pretty picture: Researchers use images like this to study how dark matter interacts with itself.

Photograph by X-ray: NASA/CXC/Ecole Polytechnique Federale de Lausanne, Switzerland/D.Harvey & NASA/CXC/Durham Univ/R.Massey; Optical & Lensing Map: NASA, ESA, D. Harvey (Ecole Polytechnique Federale de Lausanne, Switzerland) and R. Massey (Durham University, UK)

Week's Best Space Pictures: A Storm Swirls and Dark Matter Collides

A typhoon menaces the Philippines, and galaxies—and their dark matter—collide.

This is what it looks like when 72 galaxy clusters collide. The image, made by combining an x-ray view with visible light data, isn't just a pretty picture: Researchers use images like this to study how dark matter interacts with itself.

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