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So it turns out the speed of light might not be constant after all Comments

So, it seems the speed of light isn't quite constant after all. Two new studies published in the European Physical Journal D suggests that the speed of light in space isn't quite constant after all. The understanding is that space is not quite the perfect vacuum which it is often assumed to be. Continue Reading

31 - 36 of 36 Comments

  1. RainyDayInterns
    2 years ago

    "...So it turns out the speed of light might not be constant after all..."

    Ah...maybe you should change the title to " So it turns out that SPACE is not a vacuum after all"...because the speed of light is still a constant in a vacuum, as it has always been.

  2. Mike
    2 years ago

    So in a perfect vacuum the speed of light is constant. Space is not a perfect vacuum (knew that already). Nothing to see here, move along people!

    Re-edit the headline please to-light slowed down my nearly undetectable objects, such as patio door glass (my dog cant see that sometimes).

  3. Brandon Heyer
    2 years ago

    Saying the speed of light isn't constant because space is not a true vacuum is misguided. The speed of light remains constant, what doesn't is the fact that space is not a true vacuum. Which is indeed covered in the last line of the article. Too bad I had to read the whole thing to realize that the shock-value title is completely incorrect.

  4. Alexander Cerna
    2 years ago

    The speed of light is always constant in a vacuum, and is equal to the constant c. The author has said it himself, space has been discovered to be not a complete vacuum. The speed of light passing through any medium is c divided by that medium's refractive index. If that refractive index is greater than 1, then the speed of light through that medium is less than c. So, there is nothing that has been violated at all in the known equations of physics. The author, speaking in misleading statements, is doing science a disservice. He only serves to confuse ordinary people. Clarity is something this author doesn't have.

  5. JP
    2 years ago

    This article is very misleading. The speed of light *IS* constant. Scientists have always known that the time it takes light to cross some distance is slower when light encounters particles along the way. Light travels in a straight line at a constant speed. If it's travelling through water or something, it will not be able to travel in a nice direct uninterrupted path, so it takes longer to get from point A to B than it would in the ideal case. No textbook claims otherwise, and no textbook will have to change.
    It's not even a surprise that space is not a perfect vacuum. It is full of dust, background radiation, and cosmic rays. Possibly the only new information here is the numerical estimation of how much this interference hinders the propagation of light.

  6. Ryan
    2 years ago

    I'm not certain what the point of this article was at all. It is something that everyone related to physics, including high school physics students, has known for quite some time. Slow news day?

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