Why No One Has Measured The Speed Of Light

Why HN readers recommended it

Used as the standard reference in threads about light speed, clock synchronization and untestable assumptions in physics.

This is a summary from the source dataset, not an endorsement by Hacker News or the video creator.

Video & recommendation details

Creator / channel

Veritasium

Topic

one-way speed of light

Format

explainer

Level

general

HN recommenders in dataset

6

HN mentions in dataset

17

Recommendation years in dataset

2020–2024

These counts and years describe the included Hacker News records; they are not YouTube views or the video’s publication date.

From the original HN conversations

Excerpts from the recorded comments. Follow each source for the full comment and surrounding discussion.

• Veritasium recently published a video [1] on why the speed of light can't be measured one way, only two ways (i.e. the speed it travels from point A to point B then back to point A). While I'm not privy to all the physics details …

• I love Veritasium. Derek has done a number of videos that are awesome like this. The videos are great and educational, but he also manages to subtly weave in an almost spiritual subtext to them as well. For example, in this one, you learn about …

• The video in question for reference: [LINK] Interestingly, when I saw that I figured this channel for a goner because he was going to turn to the darkside, but quite contrary to expectations I feel like his channel has actually blossomed since then. His older …