Dark Energy Primordial Black Holes Observational Evidence Dark Matter Entities Dark Matter Particles Dark Matter Detection Galactic Ecosystems Self-Interaction Cosmic Expansion Influence on Galaxy Motion Galactic Dynamics Black Hole Research High-Redshift Stars Research Discoveries Vera C. Rubin Observatory Supermassive Black Holes Research Findings Dark Matter Theories Euclid Telescope Dark Matter Distribution New Cosmological Model Challenges to Prevailing Theories Gravitational Phenomena Quasars Nature of Dark Matter Mystery of Dark Matter Gravitational Lensing