NGC 470暗淡而巨大的弧圈或壳可能是与比邻星系NGC 470之间的引力碰撞形成的。
The faint, wide arcs or shells of NGC 474 could have been formed by a gravitational encounter with neighbor NGC 470.
粒子与反粒子仍然存在碰撞的机会，因为万有斥力要比电极引力弱得多。
Particles and antiparticles could still collide, however, since gravitational repulsion is much weaker than electrical attraction.
它们是不是由大爆炸之前特大质量的黑洞灾难性的碰撞引起的引力波的漏泄？
Could they be the leakage of gravitational waves caused by the cataclysmic collisions of supermassive black holes before the Big Bang?
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