We have a few basic ideas for why the universe is accelerating, but we still don't really know why it's happening.
对于宇宙为什么在加速,我们有一些基本的想法,但我们仍然不知道为什么会发生。
Crash Course Physics 速成课物理
Recent evidence suggests that the universe actually IS accelerating in its expansion, showing no signs of slowing down.
最近的证据表明,宇宙 实际上正在加速膨胀, 没有放缓的迹象。
英语百科
Accelerating expansion of the universe
The accelerating expansion of the universe is the observation that the universe appears to be expanding at an increasing rate. In formal terms, this means that the cosmic scale factor has a positive second derivative, so that the velocity at which a distant galaxy is receding from the observer is continuously increasing with time.