An expert astronomer's museum-grade presentation board for a supermassive black hole — event horizon, glowing accretion disk, relativistic jets. Left: black-and-white 2D scientific diagrams (cross-section, orbital paths, spectral analysis) with precise annotations, scale bars, and technical labels. Center: exploded axonometric or layered diagram revealing singularity core, plasma torus, and spacetime curvature layers. Right: photorealistic 3D render of the black hole in the galactic center with swirling stars and distorted light, vibrant orange and blue plasma glow, stellar debris trails. Visual style transitions from archival blueprint tones (graphite schematics, orbital precision) to cosmic atmospheric palette (deep blacks, fiery oranges, electric blues). Clean grid layout with subtle borders, ultra-detailed cinematic realism, NASA or Hubble exhibition quality, high resolution. Title block at bottom: 'SAGITTARIUS A* — COSMIC ABYSS — 4 MILLION SOLAR MASSES'.