宇宙的加速膨胀使遥远的星系能够以超过光速的速度远离地球，但这一现象并不违反爱因斯坦相对论的基本原理 1。这是因为光速限制仅适用于物体在局域空间中的运动，而不适用于空间本身的扩张过程 1。
尽管宇宙年龄约为13.77亿年，但可观测宇宙的半径达到约45亿光年 1。这一差异源于在光到达地球的数十亿年间，宇宙持续膨胀 1。星系在距地球约13.77亿光年的哈勃距离处开始以超光速后退 1。当前宇宙学事件视界约为17亿光年 1，这意味着超出此范围的星系光线最终无法到达我们 1。
随着宇宙加速膨胀的继续，这个宇宙学事件视界最终将接近约60亿光年 1。在大约1000亿年后，本星系团外的每一个星系都将逐渐从我们的视线中消失 1。
The accelerating expansion of the universe allows distant galaxies to recede from Earth at speeds exceeding that of light, yet this phenomenon does not violate Einstein's theory of relativity 1. The key to reconciling this apparent paradox lies in understanding that the cosmic speed limit applies only to objects moving through local space, not to the expansion of space itself 1.
The observable universe presents a striking contrast in scales: while the universe is approximately 13.77 billion years old, the distance to the edge of the observable universe extends to roughly 45 billion light-years 1. Galaxies begin to recede at superluminal speeds beyond the Hubble distance of approximately 13.77 billion light-years 1. Light emitted by distant galaxies takes billions of years to reach Earth, during which the universe continues to expand, meaning we observe these galaxies as they appeared in the distant past rather than their present state 1.
The accelerating cosmic expansion has profound implications for the future of our observable universe 1. The cosmological event horizon—the boundary beyond which light from distant objects can never reach us—currently spans approximately 17 billion light-years but will eventually approach roughly 60 billion light-years 1. Approximately 100 billion years from now, every galaxy beyond the Local Group will gradually disappear from view as the universe's acceleration carries them beyond our cosmic horizon 1.
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