Last Updated: February 23, 2025
The Cosmic Microwave Background: A Baby Photo Older Than Stars
Recombination released a 2.7 K glow riddled with acoustic peaks—statistical speckle that encodes density, dark matter, curvature, and the audacity of early sound waves.
Open guide ->
Last Updated: April 11, 2024
Primordial Nucleosynthesis: Three Famous Minutes
When the cosmos cooled through MeV kitchens, protons and neutrons clicked into light nuclei—predictions lock down baryon density and stress-test non-standard physics.
Open guide ->
Last Updated: January 11, 2024
Inflation: Stretch Marks on the Largest Scales
A brief accelerated expansion can flatten, smooth, and seed ripples—predictions for spectra tilt and gravitational waves separate toy models from survivors.
Open guide ->
Last Updated: May 24, 2022
Expansion History: Ladders, Supernovae, and Polite Tensions
Type Ia supernovae, CMB, and late-time rulers trace H(z)—current disagreements in H0 and S8 could mean systematics, new physics, or both wearing disguises.
Open guide ->