BLACKOUT - HIRU

MASSIVE BLACK SPEAKERS... these things have sent me partly deaf.

 ...day 3 of black...

A black hole is a curvature of spacetime geometry due to an intense gravitational field. The effects of a black hole are so extreme that even light cannot escape it.
A black hole is formed when a star of sufficient mass undergoes gravitational collapse, with most or all of its mass compressed into a sufficiently small area of space, causing infinite space time curvature at that point (a "singularity"). Such a massive space time curvature allows nothing, not even light, to escape from the "event horizon," or border.

HIRU- Basque word for the numeral 3

Image - Speakers at a party I cannot remember where now!