↩ 🔵 🔵 🔵 ❪✺❫ Physical Concepts ○ Relativity 𓆩⚪𓆪 ❪✺₂❫ Relativistic Domains ○ Event Horizon ○ Innermost Stable Circular Orbit (ISCO) ○ Spacetime ○ Synchrotron Radiation ○