Quasar Timing and Gravitational Lensing of Background Quazars

Quasar timing and gravitationaly lens systems. Light that meant to go up here somewhere can get bent by the gravity to come down and reach us. And those paths that the light takes can cause the light to travel different distances. When you start ou using gravitational lensing of background quazars to figure out the expansion rate of the universe, it's matching up with rees's team and the super nove so that data matches yea,. right?