Tag Archive for: expanding universe

Learn About the Friedmann Equation and the Cosmos
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This is an introduction to cosmology for someone who has some knowledge of calculus and basic physics. In this tutorial, we will take a journey into the…

Are Galaxy Redshifts Cosmological? The Evidence Explained
Galaxy and quasar redshifts are classified as cosmological, not "intrinsic," because they match predictions from general relativity's expanding-universe…

What Is the Steady-state Model and Why It’s No Longer Viable
Introduction to the Steady State Model
Back in 2011, I wrote a FAQ entry for Physics Forums on the steady state model and why it is no longer viable.…

Why the Big Bang Wasn’t a Black Hole: Cosmology Explained
The Big Bang was not a black hole because it happened everywhere in space at once rather than at a single point, and because the near-perfect homogeneity…

The Balloon Analogy Explained: Cosmic Expansion Without a Center
The balloon analogy uses pennies glued to an inflating balloon to show two ideas from modern cosmology: that unbound regions of the universe expand roughly…
