↩ 🔵 🔵 🔵 ❪✺₁❫ Astronomical Classes ○ ❪✺₁❫ High-Energy Astrophysics Classes ○ ❪✺₁❫ Relativistic Classes ○ Black Hole ○꠹ ❪✺₁ᵢ❫ Black Hole Classes ○ Intermediate-Mass Black Hole ○꠹ Primordial Black Hole ○꠹ Stellar-Mass Black Hole ○꠹ Supermassive Black Hole ○꠹