[quote=whizzball1]
Wait wait wait I messed up. It turns out that the Radius is what the sphere must fall , not above. So, yeah, the planet should be collapsing into a black hole right now. And there's no way to stop it unless you could somehow negate the immense gravitational pull preventing light from escaping.
[/quote]

By controlling the gravity well enough to be similar to that of Earth's.