Tag Archive for: speed of light

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

Why Is the Speed of Light the Same in All Frames of Reference?
The first thing to worry about here is that when you ask someone for a satisfying answer to a "why" question, you have to define what you think would be…

Learn About the Speed of Light and Galilean Relativity
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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…

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