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Tag Archive for: expanding universe

cosmosintro

Learn About the Friedmann Equation and the Cosmos

December 22, 2017
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6 Comments
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…
https://www.physicsforums.com/insights/wp-content/uploads/2017/12/cosmosintro.png 135 240 Arman777 https://www.physicsforums.com/insights/wp-content/uploads/2019/02/Physics_Forums_Insights_logo.png Arman7772017-12-22 06:24:202024-12-06 21:31:13Learn About the Friedmann Equation and the Cosmos
quasarredshift

Are Galaxy Redshifts Cosmological? The Evidence Explained

January 23, 2016
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0 Comments
Galaxy and quasar redshifts are classified as cosmological, not "intrinsic," because they match predictions from general relativity's expanding-universe…
https://www.physicsforums.com/insights/wp-content/uploads/2016/01/quasarredshift.png 135 240 Multiple_Authors https://www.physicsforums.com/insights/wp-content/uploads/2019/02/Physics_Forums_Insights_logo.png Multiple_Authors2016-01-23 16:21:152026-07-31 11:21:09Are Galaxy Redshifts Cosmological? The Evidence Explained
steadystate

What Is the Steady-state Model and Why It’s No Longer Viable

December 8, 2015
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.…
https://www.physicsforums.com/insights/wp-content/uploads/2015/12/steadystate.png 135 240 bcrowell https://www.physicsforums.com/insights/wp-content/uploads/2019/02/Physics_Forums_Insights_logo.png bcrowell2015-12-08 14:37:432024-08-17 06:38:50What Is the Steady-state Model and Why It’s No Longer Viable
blackholesuniverse

Why the Big Bang Wasn’t a Black Hole: Cosmology Explained

November 30, 2015
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7 Comments
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…
https://www.physicsforums.com/insights/wp-content/uploads/2015/11/blackholesuniverse.png 135 240 Multiple_Authors https://www.physicsforums.com/insights/wp-content/uploads/2019/02/Physics_Forums_Insights_logo.png Multiple_Authors2015-11-30 00:47:482026-07-31 11:00:40Why the Big Bang Wasn’t a Black Hole: Cosmology Explained
balloonanalogy

The Balloon Analogy Explained: Cosmic Expansion Without a Center

September 16, 2015
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62 Comments
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…
https://www.physicsforums.com/insights/wp-content/uploads/2015/09/balloonanalogy.png 135 240 phinds https://www.physicsforums.com/insights/wp-content/uploads/2019/02/Physics_Forums_Insights_logo.png phinds2015-09-16 16:50:452026-07-31 13:00:59The Balloon Analogy Explained: Cosmic Expansion Without a Center

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