Is Empty Space Really Empty? A 90-Year-Old Mystery Gets Its Answer (S05E168 — The Weekend Wrap)
Today's episode — S05E168, Saturday August 15, 2026, our "Weekend Wrap":
**Main story: a magnetar confirms 90-year-old vacuum birefringence prediction.** A team led by Rachael Stewart (George Washington University), using NASA's IXPE spacecraft, found the strongest evidence yet that extreme magnetic fields polarize light passing through empty space — confirming a 1936 prediction by Werner Heisenberg and Hans Euler. The team studied magnetar 1E 1547-5408 and found X-rays nearly 3x more polarized than expected, in a direction matching the star's magnetic field. Published August 5 in *Nature*…
The skinny
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