Happened to me too! Had to call Comcast several times until got through drones to a supervisor. He confirmed that account was properly closed, said "what's the fuck?" and faxed me a letter to send to collectors. Also, it seems, he did something on his side too - issue got resolved without any blemishes to my credit history.
Case in point: linear algebra libraries (like 80% of scientific computing). Basically people are modifying algorithms so that bulk of computation is done in single precision and then cleaned up in double. Those mixed mode algorithms often outperform pure DP ones even on non crippled cards (for example MAGMA library).
People don't like to be screwed with...
How many satellites heard the pings?
Considering that the arcs are, well, arcs, I'll take a wild guess and say that they had data from only one satellite...
Some spy birds might help, but they tend to focus on land areas.
We warn the reader in advance that the proof presented here depends on a clever but highly unmotivated trick. -- Howard Anton, "Elementary Linear Algebra"