Re: To quote a well known phrase...
"Who knows when they'll deorbit on their own and the plan is to have better than 12,000 of them flying."
Who knows? The people who put them up there and the people who monitor that sort of stuff. They may not know exactly when they will come back down, but there are known factors. They are low enough that they need station keeping fuel to stop them falling.
Biting the hand that feeds IT
