In astrophysics, an event horizon is a boundary, beyond which, events cannot affect an observer.
A black hole is a region of spacetime exhibiting gravitational acceleration so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it.
At the center of a black hole, as described by general relativity, may lie a gravitational singularity, a region where the spacetime curvature becomes infinite.
Event Horizon
3 rounds
500 m row
2 muscle ups
10 pistols
Black hole
???
Singularity
???
Quarter Deck Athletics: CrossFit Gym, Chiropractic, and Nutrition in Buffalo, N.Y. 