Science Gamma radiation from space has very high energy levels. What is the theoretical limit on the energies of gamma-ray photons? Is there a current technology to detect and measure the highest energy level?
Exotic Objects, Science Your October 2016 article on black holes describes a singularity with infinite density. It has been my understanding that anything with infinite density also has infinite mass and infinite gravitational attraction. Wouldn’t anything with infinite attraction collapse the universe?
Exoplanets If another planet existed that was precisely our size and in our exact orbit, but placed behind the Sun, would we have the means to detect its existence?
