↩ 🔵 🔵 🔵 ❪✺₁❫ Relativistic Classes ○ ❪✺_❫ Physical Subs ○ Gravity ⚪ Wave ○꠹ Gravitational-Wave Astronomy ○𓆪 Also: ❪𖣐₂’❫ Gravitational-Wave Observatories ○