<ul><li>Researchers have developed a technique for weighing giant filaments of dark matter, which make up the cosmic web.</li><li>The technique relies on the relationship between the amount of dark matter and the motion of galaxies within the filaments.</li><li>The spread in velocities of galaxies corresponds to the amount of dark matter in that section of the filament.</li><li>Mapping the spread in galaxy velocities along the length of the filaments can provide information about the mass of the underlying filament.</li></ul>

Here’s how to weigh gigantic filaments of dark matter

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