Observable Universe

According to some estimates, if the Universe were the size of the earth, the amount of the Universe that we could see would be the size of a proton.

4 thoughts on “Observable Universe”

  1. Inflation did it – The early universes expanded faster then the speed of light, during a period called inflation. The light of most of the univers has not reached us yet.

  2. … – how big’s a proton…and who really has nothing better to do with their time than write stuff like this…at least the yelling and coffee one was mildly interesting

  3. That makes no sense – According to conventional quantum dynamics protons are elamentary point-particles, meaning they have no size at all, only mass, spin, momentum, location, etc. Now, if the portion of the universe that we can see is finite, and the universe is infinite, than that makes sense. But the universe is not infinite, but is the product of the speed of light and the age of the universe. Also, estimates of the size of the observable universe vary tremendously, by sometimes more than 4 billion light years. Now, it is true that according to modern theories protons, neutrons, and several other kinds of massive particles are probably actually made up of three particles, known as quarks, a piece. These quarks are so incredibly close that the radius of a proton is unknown, and incredibly far beyond our ability to currently probe.

  4. That makes no sense – According to conventional quantum dynamics protons are elamentary point-particles, meaning they have no size at all, only mass, spin, momentum, location, etc. Now, if the portion of the universe that we can see is finite, and the universe is infinite, than that makes sense. But the universe is not infinite, but is the product of the speed of light and the age of the universe. Also, estimates of the size of the observable universe vary tremendously, by sometimes more than 4 billion light years. Now, it is true that according to modern theories protons, neutrons, and several other kinds of massive particles are probably actually made up of three particles, known as quarks, a piece. These quarks are so incredibly close that the radius of a proton is unknown, and incredibly far beyond our ability to currently probe. Oh, and it is impossible for anything to move faster than the speed of light (excluding hypothetical tachyons that always moved faster than the speed of light, but these are thought not to exist), so I am confident the entire universe could not. Spacetime itself is usually said to unfold at exactly the speed of light.

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