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  1. The animation nicely illustrates gravitational lensing. The black hole here is taken to have a radius equal to that of the Earth, which requires that the mass of the black hole be about 2,000 suns. The Earth orbits at 3 Schwarzschild radii (the minimum stable circular orbit), and we observe at rest from a distance of 5 Schwarzschild radii. For these parameters, we would see the Earth orbit the black hole 80 times per second.
    This animation is not realistic! The Earth would be tidally torn apart in about one orbit if it were orbiting this close to a black hole of this mass.

  2. Wouldn’t there be such gravitational forces as to increase the planetary temperature to dramatically change the surface?

  3. When the Earth is approaching from the left, I notice that it does get a bit brighter, and more blue. I’m assuming that is redshifting coming into play. If this is the case, why does the light of the approaching Earth not turn reddish for the wrap-around effect on the receding side?

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