
20190403: The Edge of an Infinite Universe
 10:22: Those circle segments represent the straight lines of a hyperbolic geometry projected onto the disk.


20170215: Telescopes of Tomorrow
 11:57: The hyperbolic geometry is just what you did when you map the spacetime interval to a third dimension.


20161116: Strange Stars
 11:45: ... space will definitely have weird angles, less than 180 degrees for a hyperbolic geometry, more than 180 for a spherical ...
