《小宇宙：致命一击》讲述了大约500万年前，恐龙突然从地球上消失，许多人推论认为是受到大型彗星撞击地球所致。然而这种毁天灭地的彗星撞击可能再次发生吗？科学家们预测，一个一英里宽的小行星就足以造成整个地球的大灾难。让我们加入…

Is it humankind's greatest achievement? 12 billion miles away a tiny spaceship is leaving our Solar System and entering the void of deep space. It is the first human-made object ever to do so. Slowly dying within its…