Horizon looks at dark energy - the mysterious force that is unexpectedly causing the universe's expansion to speed up. The effects of dark energy were discovered in 1998 but physicists still don't know what it is. Worse, 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 en... 可能你会想看:精灵宝可梦·地平线境界线上的地平线2境界线上的地平线地平线2024宝可梦地平线台配地平线系列：大黑洞的恐惧BBC地平线：我们身处哪个宇宙BBC地平线.七千万动物木乃伊.古埃及的暗黑秘密BBC地平线.最初的不列颠人地平线系列：我们为何讲话？
最大资源1集
