Apparently, this user prefers to keep an air of mystery about them.
7 Does light really “travel”? Mar 14 '13
4 Is such an orbit possible that allows a satellite on Earth and another on Mars to always be in direct line-of-sight? Sep 27 '13
3 How fast does a black hole appear to decay from infalling observer's perspective? [duplicate] Jun 3 '15
2 What happens at the moment black hole is created? Feb 17 '13