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physics.pop-ph2026
"It's getting away from us!" - Black Hole Horizons and Relative Speed
Markus Pössel
Black holes hold considerable fascination for the general public and students alike, and are commonly included in general-science courses on astronomy or modern physics. But teachi…
physics.pop-ph2024
Black holes, Achilles and the original tortoise coordinate
Markus Pössel
The "frozen star" picture of black holes, based on the fact that an outside observer will never see a collapsing sphere shrink sufficiently to form a black hole horizon, was a hist…