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Below the Mesh

The light year is a bookkeeping unit that has been promoted, by repetition and by the poverty of better language, into a cosmic speed limit. Both halves of that sentence are wrong in slightly different ways. A light year measures the distance a photon covers in one orbit of Earth around the Sun, and it measures that distance against the stage on which photons and Earths and Suns appear. We treat that stage as the bedrock of reality because every instrument we have ever built reports back from inside it. Our instruments cannot, by their nature, report from anywhere else. A fish with sophisticated sonar maps the reef in exquisite detail and concludes the reef is all there is. The water is invisible because the water is the medium of seeing.

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‘c’: More Than Just Fast as We Unpack the Universe’s Master Constant

Let’s dive into the universe’s ultimate speed limit: the speed of light. It’s a concept so fundamental that it underpins much of modern physics, yet so mind-bogglingly fast that, as you say, human intuition struggles to truly grasp it. We call it ‘c’, and its value in a vacuum is precisely 299,792,458 meters per second. That’s not just an estimate; since 1983, the meter has been precisely defined as the distance that light travels in a vacuum in exactly 1/299,792,458 of a second. So, light’s speed isn’t just something we measure; it’s a foundational pillar of our measurement system.

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On Becoming Question Centric

We live in a world where answers are given more value than the questions being asked.  We want results, not idle inquiry.  We reward the definite and the concrete while dismissing the unanswerable and the curious.  Today, I argue, the best of us really rests in the questions we ask and not in the answers we provide.  When Albert Einstein was a teenager, he asked this question:  “What would happen if I could imprison a ray of light?”  Nobody had the answer to his question.  For the rest of his life, he honored his own childhood wondering and brought the rest of us into his light.

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Einstein and the Vatican Rock the Secular Universe

God believers have always held up Albert Einstein — the World’s Smartest Man — as evidence that God exists because they believe Einstein said God was real.

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