Kugelblitz

Part of speech: noun

Pronunciation: /ˈkuːɡl̩ˌblɪt͡s/

Definitions

1. A theoretical construct in astrophysics where intense light concentration generates a gravitational field capable of trapping matter within it
2. An idea in theoretical physics that envisions a luminous sphere creating sufficient gravity to draw in nearby objects due to its energy density
3. A conceptual model in astrophysics describing how a concentrated beam of light could create a gravitational pull strong enough to attract surrounding matter

Etymology: "Kugelblitz" is German for "ball lightning," a compound of "Kugel" (sphere, ball) and "Blitz" (lightning). The English word borrows the German name for a real atmospheric phenomenon and applies it to something far stranger in physics: a hypothetical black hole formed not from collapsed matter but from concentrated light. The idea works like this. If enough energy, such as electromagnetic radiation, is packed into a small enough sphere, its energy density can become great enough that the region curls space around itself and forms an event horizon, just as a massive star does when it collapses. The result would be a black hole made of light alone, which is why the name fits: a glowing ball whose lightning-like energy has been trapped by its own gravity.