Tag Archives: Sgr A*

Optics of the Event Horizon Telescope

Gravitational bending of light rays near objects of size approaching 2MG/c2 (gravitational radius or ‘event horizon’) is known to be severe.  Light rays circle indefinitely at 3MG/c2  as Charles Darwin (the grandson) described in 1958.  Gravitational lensing causes more distant … Continue reading

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