Dark matter does not emit light or energy, but exhibits measurable gravitational effects on large structures in the universe such as galaxies and galaxy clusters.Roughly 80% of the mass of the universe is made up of material that scientists cannot directly observe.Elongated slip stitches and lace highlight variegated yarn, pulling the colors back and forth like gravitational force.Yardage approx. 360 (380, 400) yds This pattern has been professionally tech edited.