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Would such a burst travel through the body of a planet? If not, perhaps only half of the galaxy’s life would be wiped out.

Absolutely, as if it was basically not there.

Surely the Earth would be too thick for that?

We're dealing with incomprehensible amounts of energy. GRBs are powered by the violent deaths of massive stars. Orbiting planets are inconsequential.

Have a fun paper!

Stars Bisected by Relativistic Blades

I thought only neutrinos could do this?