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
2 What happens at the moment black hole is created? feb 17 '13