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?
Science I often read about a sunspot on the western limb of the Sun, or a crater on the eastern limb of the Moon, etc. As there is no “up” in space, how are north, south, east, and west determined?
Science One winter morning as I was driving to work, I looked to the east, and the Sun was about 20° above the horizon. A solid bright column of light came straight down from it to the horizon. What causes this, what is it called, and is this related to any archaeological finds such as the obelisks of Egypt?
