The equations say that something has to be holding all these galaxies together, or they’d just fly apart. That’s dark matter – has a new experiment finally found it?
Clusters of galaxies are the largest gravitationally bound objects in the Universe and, together, the places where dark matter concentrates the most, so they are considered promising targets for such a search. The strongest signal was given by the three most massive swarms — Virgo, Furnace, and Snake — where the highest annihilation signal is expected.
Putting their data together, the gamma-line of 43 gigaelectronvolts turned out to be very stat…