↩ 🔵 🔵 🔵 ❪✺❫ Astronomical Concepts ○ ❪✺₁❫ Physical Classes ○ ❪✺₁.❫ Classes of Astronomical Objects ○ ❪✺₁❫ Cosmological Classes ○ ❪✺₁❫ High-Energy Astrophysics Classes ○ Accretion Disk ○꠹ Astronomical Object ○꠹ Catalog ○꠹ Color-Color Diagram ○꠹ Compact Object ○꠹ Cosmic Ray ○꠹ Epoch ○꠹ Jet ○꠹ Lagrange Point ○꠹ Light Curve ○꠹ Orbit ○꠹ Stellar Wind ○꠹ Survey ○꠹