<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.
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.
