Region of spacetime from which nothing can escape; bounded by an event horizon. Stellar-mass (3–100 M_☉) and supermassive (10⁶–10¹⁰ M_☉) populations confirmed; mergers detected via gravitational waves.
Region of spacetime from which nothing can escape; bounded by an event horizon. Stellar-mass (3–100 M_☉) and supermassive (10⁶–10¹⁰ M_☉) populations confirmed; mergers detected via gravitational waves.