![]() Objects that recede beyond the cosmic event horizon will eventually become unobservable, as no new light from them will be capable of overcoming the universe's expansion, limiting the size of our observable universe.Īs an effect of general relativity, the expansion of the universe is different from the expansions and explosions seen in daily life. While objects within space cannot travel faster than light, this limitation does not apply to the effects of changes in the metric itself. To any observer in the universe, it appears that all of space is expanding, and that all but the nearest galaxies (which are bound by gravity) recede at speeds that are proportional to their distance from the observer. ![]() As the spatial part of the universe's spacetime metric increases in scale, objects become more distant from one another at ever-increasing speeds. This expansion involves neither space nor objects in space "moving" in a traditional sense, but rather it is the metric (which governs the size and geometry of spacetime itself) that changes in scale. The universe does not expand "into" anything and does not require space to exist "outside" it. It is an intrinsic expansion whereby the scale of space itself changes. The expansion of the universe is the increase in distance between any two given gravitationally unbound parts of the observable universe with time.
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