Examining Dark Energy, the mysterious force that is unexpectedly causing the universe's expansion to speed up. Its effects were discovered in 1998, but physicists still do not know what it is, and its very existence calls into question Albert Einstein's General Theory of Relativity; the cornerstone of modern physics. The hunt for the identity of Dark Energy is on, and although experiments conducted on earth and in space generate data that might provide a clue, physics is hoping another Einstein might emerge and write a new theory that explains the mystery.

地平线着眼于暗能量——一种出乎意料地导致宇宙膨胀加速的神秘力量。暗能量的影响是在1998年发现的，但物理学家仍然不知道它是什么。更糟糕的是，它的存在本身就对阿尔伯特·爱因斯坦的广义相对论提出了质疑，而广义相对论是现代物理学的基石。寻找暗能量的身份正在进行中。地球和太空的实验产生了可能提供线索的数据，但也有希望出现另一个爱因斯坦——一个可以写一个新理论来解释暗能量之谜的人。