All the rest of the mass appears to be made of an invisible substance called dark matter. It emits and absorbs no light, but we can observe its gravitational effect on normal matter. Dark matter holds together the collections of stars called galaxies, and determines where galaxies gather together in clusters and filaments. Life universe 42 everything shirt, hoodie, tank top. Get it now or Regret later. This is the official design. Available all shapes for men and women. Click it and enjoy this
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