An international team of researchers has found dark matter dominating the halos of two supermassive black holes in galaxies roughly 13 billion light years away. Their study, published in The Astrophysical Journal,

Dark matter is a mysterious, invisible substance that makes up most of the universe’s mass. Scientists can’t see it directly, but they know it’s there because of the way it affects galaxies. In the 1970s, astronomer Vera Rubin found the first strong evidence of dark matter.

Researchers said on Thursday that they had discovered twin-lobed radio jets they suspect were formed when the universe was 1.2 billion years old, stretching at least twice the length of the Milky Way galaxy.

Astronomers have detected an enormous black hole-powered jet that stretches an astonishing 200,000 light-years, making it twice as long as the Milky Way. This colossal cosmic jet, erupting from the quasar J1601+3102,