A Radically Conservative Solution for Cosmology’s Biggest Mystery

The conflicting measurements have vexed astrophysicists and inspired rampant speculation as to whether unknown physical processes might be causing the discrepancy. Maybe dark matter particles are interacting strongly with the regular matter of planets, stars and galaxies? Or perhaps an exotic particle not yet detected, such as the so-called sterile neutrino, might be playing a role.

The possibilities are as boundless as the imaginations of theoretical physicists.

Source: quantamagazine.org