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Is observability restricted by scale ?

  1. Jan 23, 2006 #1
    I read somewhere something about observability, and things which are infinitely big, or infinitesimally small.

    Basically, the question is whether it would be possible to make an observation of an infinitely long yardstick. If it existed, could you observe it in it's entirety ? is it possible ?

    Same argument for the infinitessimally small, disregarding Planck length for the moment - would it even be "possible" to observe the infinitessimally small ?

    Will Kennedy

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    Last edited by a moderator: Jan 24, 2006
  2. jcsd
  3. Jan 23, 2006 #2


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    Infinity is an abstract concept. It doesn't really exist in the universe. Once an object (or volume of energy) exists a point in time and space, any change can only result in a finite amount of distance and time passed from the starting point, unless the object ceases to exist.

    Even if you were to live "forever" your age would alway be finite since you exist now. If you were to travel "forever", your distance from the starting point would always be finite, since you existed at the starting point.
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