  A recent refinement of Penrose's conformal framework for asymptotically flat
space-times is summarized. The key idea concerns advanced and retarded
conformal factors, which allow a rigid description of infinity as a locally
metric light cone. In the new framework, the Bondi-Sachs energy-flux integrals
of ingoing and outgoing gravitational radiation decay at spatial infinity such
that the total radiated energy is finite, and the Bondi-Sachs energy-momentum
has a unique limit at spatial infinity, coinciding with the uniquely rendered
ADM energy-momentum.
