# What would happen if a planet's escape velocity exceeded the speed of light?

What would happen if a planet's escape velocity exceeded the speed of light? Would it also collapse into a black hole (by Heisenberg's uncertainty principle and Pauli's exclusion principle) or would it just remain as it is?

• If its escape velocity exceeded the speed of light, it would already be a black hole. – D. Halsey Feb 19 '19 at 1:59

Anyway, before general relativity, the answer to your question was by John Mitchell who conceptualized the so called "dark star" in Newtonian physics, and it is defined exactly as you wish ($$v_{esc} \geq c$$).