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Loading contentThe scientific story of the cosmos — how it began, how it evolved, and how we know. Each lesson connects to real cosmology entities, with the scientific consensus made explicit.
The hot, dense early state from which the observable Universe has been expanding for about 13.8 billion years.
The unknown component driving the accelerating expansion of the Universe, making up roughly 68% of it.
The standard model of cosmology: a flat, expanding Universe dominated by a cosmological constant (Λ) and cold dark matter (CDM).
Einstein's theory of gravity as the curvature of spacetime by mass and energy. Published in 1915, it predicted the bending of starlight, the precession of Mercury's orbit, black holes, an expanding universe, and gravitational waves —…