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If for some reason you have a balloon covered in ants, and you inflate it slowly, then the ants that are nose-to-nose (pardon, “antennae-to-antennae”) with each other will barely notice the expansion.
However, the farther two ants are apart, the more the expansion increases the distance between them.
If an ant on one side tries to run to one of her sisters on the far side of the balloon, she may find that the distance between the two of them is increasing faster than she can close that distance.
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Physicist: You’ll often hear that “the universe is expanding faster than the speed of light”.
The speed at which the ant runs is described with respect to the part of the balloon it’s presently standing on and the speed at which light travels is with respect to the space it travels through (technically with respect to objects that are “sitting still” in space).The oldest photons we see are those that have come from just barely on the near side of the distance at which light can’t close the gap.
In the meantime we will do our best to deliver the best possible gaming experience by further improving our website. First, the universe doesn’t expand at a particular .Right now it’s about 70 kilometers per second per megaparsec.You can use a rule (maybe a tape measure) and a stopwatch and you can say “dudes and dudettes of the physics world, the of expansion is ____”.Even worse, when a balloon expands it expands into the space around it, which begs the question “what is the universe expanding into? But keep in mind, all that physics really talks about is the relationship between things of the balloon).The easiest way to think about the expansion of the universe is to think about the expansion of something simpler, like a balloon.