科学家们已发现明显的迹象表明：太阳有一个小弟弟，它是一颗暗星，其偏心轨道导致彗星群和流星雨周期性降落地球。
Scientists have found compelling evidence that the sun has a baby brother , a dark star whose eccentric orbit is responsible for periodically showering the earth with comets and meteorites .
彗星群