Notes on verification

Confirmed by multiple independent, high-quality sources including NASA, Harvard CfA, Britannica, and Nobel Prize committee materials, with measurements from Nobel-winning research using decades of stellar orbit tracking and further corroborated by ESO and Event Horizon Telescope observations. [cascade flags: aggregator_dropped_primary_exists,wikipedia_dropped_other_sources_exist | tier=silver indep_score=1.0 clusters=5 claim_tier=notable | framework convergence=partial on Stellar orbit dynamics (S2/S0-2 star orbital tracking) around Sgr A*, cross-validated by independent teams and later by EHT imaging and gas-cloud dynamics (upstreams: Reinhard Genzel's Galactic Center group (MPE), Andrea Ghez's UCLA group (Keck Telescope observations), GRAVITY Collaboration) — publishers independent, evidence may not be | kind=empirical eligibility=high]