The Origin of Urantia

57:7.1Through­out these early times the space re­gions of the so­lar sys­tem were swarm­ing with small dis­rup­tive and con­den­sa­tion bod­ies, and in the ab­sence of a pro­tec­tive com­bus­tion at­mo­sphere such space bod­ies crashed di­rectly on the sur­face of Uran­tia. These in­ces­sant im­pacts kept the sur­face of the planet more or less heated, and this, to­gether with the in­creased ac­tion of grav­ity as the sphere grew larger, be­gan to set in op­er­a­tion those in­flu­ences which grad­u­ally caused the heav­ier el­e­ments, such as iron, to set­tle more and more to­ward the cen­ter of the planet.

57:7.22,000,000,000 years ago the earth be­gan de­cid­edly to gain on the moon. Al­ways had the planet been larger than its satel­lite, but there was not so much dif­fer­ence in size un­til about this time, when enor­mous space bod­ies were cap­tured by the earth. Uran­tia was then about one fifth its pres­ent size and had be­come large enough to hold the prim­i­tive at­mo­sphere which had be­gun to ap­pear as a re­sult of the in­ter­nal el­e­men­tal con­test be­tween the heated in­te­rior and the cool­ing crust.

57:7.3Def­i­nite vol­canic ac­tion dates from these times. The in­ter­nal heat of the earth con­tin­ued to be aug­mented by the deeper and deeper burial of the ra­dioac­tive or heav­ier el­e­ments brought in from space by the me­te­ors. The study of these ra­dioac­tive el­e­ments will re­veal that Uran­tia is more than one bil­lion years old on its sur­face. The ra­dium clock is your most re­li­able time­piece for mak­ing sci­en­tific es­ti­mates of the age of the planet, but all such es­ti­mates are too short be­cause the ra­dioac­tive ma­te­ri­als open to your scrutiny are all de­rived from the earth’s sur­face and hence rep­re­sent Uran­tia’s com­par­a­tively re­cent ac­quire­ments of these el­e­ments.

57:7.41,500,000,000 years ago the earth was two thirds its pres­ent size, while the moon was near­ing its pres­ent mass. Earth’s rapid gain over the moon in size en­abled it to be­gin the slow rob­bery of the lit­tle at­mo­sphere which its satel­lite orig­i­nally had.

57:7.5Vol­canic ac­tion is now at its height. The whole earth is a ver­i­ta­ble fiery in­ferno, the sur­face re­sem­bling its ear­lier molten state be­fore the heav­ier met­als grav­i­tated to­ward the cen­ter. This is the vol­canic age. Nev­er­the­less, a crust, con­sist­ing chiefly of the com­par­a­tively lighter gran­ite, is grad­u­ally form­ing. The stage is be­ing set for a planet which can some­day sup­port life.

57:7.6The prim­i­tive plan­e­tary at­mo­sphere is slowly evolv­ing, now con­tain­ing some wa­ter va­por, car­bon monox­ide, car­bon diox­ide, and hy­dro­gen chlo­ride, but there is lit­tle or no free ni­tro­gen or free oxy­gen. The at­mo­sphere of a world in the vol­canic age pre­sents a queer spec­ta­cle. In ad­di­tion to the gases enu­mer­ated it is heav­ily charged with nu­mer­ous vol­canic gases and, as the air belt ma­tures, with the com­bus­tion prod­ucts of the heavy me­te­oric show­ers which are con­stantly hurtling in upon the plan­e­tary sur­face. Such me­te­oric com­bus­tion keeps the at­mo­spheric oxy­gen very nearly ex­hausted, and the rate of me­te­oric bom­bard­ment is still tremen­dous.

57:7.7Pres­ently, the at­mo­sphere be­came more set­tled and cooled suf­fi­ciently to start pre­cip­i­ta­tion of rain on the hot rocky sur­face of the planet. For thou­sands of years Uran­tia was en­veloped in one vast and con­tin­u­ous blan­ket of steam. And dur­ing these ages the sun never shone upon the earth’s sur­face.

57:7.8Much of the car­bon of the at­mo­sphere was ab­stracted to form the car­bon­ates of the var­i­ous met­als which abounded in the su­per­fi­cial lay­ers of the planet. Later on, much greater quan­ti­ties of these car­bon gases were con­sumed by the early and pro­lific plant life.

57:7.9Even in the later pe­ri­ods the con­tin­u­ing lava flows and the in­com­ing me­te­ors kept the oxy­gen of the air al­most com­pletely used up. Even the early de­posits of the soon ap­pear­ing prim­i­tive ocean con­tain no col­ored stones or shales. And for a long time af­ter this ocean ap­peared, there was vir­tu­ally no free oxy­gen in the at­mo­sphere; and it did not ap­pear in sig­nif­i­cant quan­ti­ties un­til it was later gen­er­ated by the sea­weeds and other forms of veg­etable life.

57:7.10The prim­i­tive plan­e­tary at­mo­sphere of the vol­canic age af­fords lit­tle pro­tec­tion against the col­li­sional im­pacts of the me­te­oric swarms. Mil­lions upon mil­lions of me­te­ors are able to pen­e­trate such an air belt to smash against the plan­e­tary crust as solid bod­ies. But as time passes, fewer and fewer prove large enough to re­sist the ever-stronger fric­tion shield of the oxy­gen-en­rich­ing at­mo­sphere of the later eras.