This paper proposes that space is not empty but constitutes a semifluid medium of variable density, — The Big Bang represents the sole initial condition of the current cycle. The universe is cyclic: the semifluid progressively hardens as energy disperses, galaxies implode into central black holes, which are reabsorbed until critical mass triggers a new Big Bang. This single mechanism accounts for: dark matter, dark energy, the Hubble Tension, black hole formation, gravitational lensing, and the cyclic nature of the universe. A concrete laboratory experiment using Helium-3 across all states of matter is proposed as a cosmic semifluid analog. Independent theoretical framework developed March 3, 2026.

document 2 includes a Technical Note on potential systematic biases in the Einstein Telescope (ET) calibration