1. Which feature is found with Kerr black holes but not Schwarzschild black holes? a. a singularity, b. an event horizon, c. gravitational redshift of photons outside of the black hole, d. an...

1. Which feature is found with Kerr black holes but not Schwarzschild black holes? a. a singularity, b. an event horizon, c. gravitational redshift of photons outside of the black hole, d. an ergoregion, e. warping of nearby spacetime

2. Under what conditions do all outward pressures on a collapsing star fail to stop its inward motion?