NASA发现了七个新的"暗彗星" 可能是了解生命起源的关键 NASA discovers seven new "dark comets," potentially key to understanding life's origins.

美国航天局发现了7个新的“暗彗星”,将已知的数数增加一倍至14个。 NASA has found seven new "dark comets," doubling the known count to 14. 这些物体看上去像小行星,但表现得像彗星,有两种不同的组别:在外太阳系内有偏心轨道的大类和在内行星附近有近圆形轨道的小类。 These objects look like asteroids but behave like comets, with two distinct groups: larger ones with eccentric orbits in the outer solar system and smaller ones with nearly circular orbits near the inner planets. 在《国家科学院议事录》上发表的这一发现表明,暗彗星可能提供了地球上生命所必需的材料。 The discovery, published in the Proceedings of the National Academy of Sciences, suggests dark comets might have delivered materials essential for life on Earth.