Why Black Holes Don't Incinerate What Falls In ✎ express
Stephen Hawking showed that black holes emit particles and eventually evaporate. But where does the information about what fell in go? The firewall idea suggested that anything crossing the horizon meets a blazing wall. This conflicts with the smooth curvature of spacetime. However, the hole's interior and its radiation can't be separated. They're woven together like sheets in a book: a mark on one instantaneously transfers to the others. Gravity stitches them into a unified whole. Curiously, any point inside the hole carries an imprint of everything that fell in, as if each page holds the entire text. So there's no firewall: the horizon is calm, and entropy (a measure of disorder) changes smoothly.
If a coin-sized black hole had a firewall, it would instantly incinerate everything around it. Luckily, nature chose a more subtle path.
The paradox inspired plots like Interstellar, where the protagonist falls into a black hole and sends messages. Reality promises a more clever mechanism without the needless drama.