Atmospheric oxygen exhausted by combustion of. [1] Awesome to early man. [2] Bombard nonbreathing worlds. [3] Comets and meteors comprise enormous amounts of matter. [4] Diving into suns, meteors are source of solar energy. [5] Few large enough to penetrate current atmosphere. [6] Fragments of disrupted space bodies. [7] Generally composed of heavy materials; accumulated on ocean bottoms. [8] Indicated arrival on earth of special spirits. [9] Large portion recaptured by sun. [10] Meteoric era was from 2 billion to 1 billion years ago. [11] Millions of meteorites enter Urantia atmosphere daily at rate of 200 miles/sec. [12] Planets grow by accretion from. [13] Primitive atmosphere afforded little protection against. [14] Solar matter. [15] Some comets consist of swarms of. [16]