The four pillars of modern cosmology: expansion, relic radiation, primordial elements, and the cosmic web.
The expanding universe implies a hot, dense early state and a testable cosmic origin.
Slipher and Hubble linked galaxy redshifts to distance, revealing cosmic expansion.
The cosmic microwave background is the near-uniform relic glow from the early hot universe.
Big Bang nucleosynthesis explains primordial hydrogen, helium, and lithium in line with observations.
Simulations and surveys show large-scale structure shaped by gravity and dark matter.
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