Way back when I was in grade school, I remember being told the Earth had two moons. There was the one we could see at night and then there was a second moon that circled the earth but was too small to see with the naked eye. This came up on many occasions as we moved from year to year. Then it just kind of faded away. No one mentioned it after that. I used to wonder what happened to our other moon. Then I found out, it wasn’t a moon but a satellite. A dark satellite. The Black Knight is an artificial satellite of extraterrestrial origin which has orbited Earth for a long time. Some say it’s only been here for a few hundred years and other say it more like around 13,000 years.