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Speed of Light Articles

Tag Archive for: speed of light

universeexpansion

At What Velocity Does the Universe Expand and Can It Be Faster than Light?

February 9, 2016
Neither of these questions makes sense in the form in which it was posed. To see why, let's start by thinking about how we know the universe is expanding.The…
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speedlightframe

Why Is the Speed of Light the Same in All Frames of Reference?

January 17, 2016
Why ask "why" about physical laws? The first thing to worry about here is that when you ask someone for a satisfying answer to a "why" question, you…
https://www.physicsforums.com/insights/wp-content/uploads/2016/01/speedlightframe.png 135 240 bcrowell https://www.physicsforums.com/insights/wp-content/uploads/2019/02/Physics_Forums_Insights_logo.png bcrowell2016-01-17 20:04:102026-02-16 18:36:26Why Is the Speed of Light the Same in All Frames of Reference?
speedoflight1

Learn About the Speed of Light and Galilean Relativity

December 22, 2015
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39 Comments
Introduction In this article, I will discuss some experiments in the 19th and early 20th centuries that looked at how the velocity of a light source affects…
https://www.physicsforums.com/insights/wp-content/uploads/2015/12/speedoflight1.png 135 240 Alex Klotz https://www.physicsforums.com/insights/wp-content/uploads/2019/02/Physics_Forums_Insights_logo.png Alex Klotz2015-12-22 14:50:452025-02-11 19:43:48Learn About the Speed of Light and Galilean Relativity
speedoflight

Why Does C Have a Particular Value, and Can It Change?

September 10, 2015
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53 Comments
Short answer: Because c (speed of light) has units, its value is what it is only because of our choice of units, and there is no meaningful way to test…
https://www.physicsforums.com/insights/wp-content/uploads/2015/09/speedoflight.png 135 240 bcrowell https://www.physicsforums.com/insights/wp-content/uploads/2019/02/Physics_Forums_Insights_logo.png bcrowell2015-09-10 15:58:412026-02-16 17:07:15Why Does C Have a Particular Value, and Can It Change?

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