An impact (on the Mars) capable of ejecting a fragment of the Martian
surface into an Earth-intersecting orbit is even less probable than such an
event on the Moon, in view of the Moon’s smaller size and closer proximity to
Earth.
(on the Mars) 在句中是省略的,such an event 在这里是否有指代不清的嫌疑?
还是说ejecting a fragment of the Martian surface on the moon 这句话说不通?