Life-bearing primordial planets in the solar vicinity

被引：8
作者：
Wickramasinghe, N. Chandra [1 ]
Wallis, Jamie [2 ]
Wallis, Daryl H. [1 ]
Schild, Rudolph E. [3 ]
Gibson, Carl H. [1 ,4 ]
机构：
[1] Univ Buckingham, Buckingham Ctr Astrobiol, Buckingham MK18 1EG, England
[2] Cardiff Univ, Sch Math, Cardiff, S Glam, Wales
[3] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[4] Univ Calif San Diego, La Jolla, CA 92093 USA
来源：
ASTROPHYSICS AND SPACE SCIENCE | 2012年 / 341卷 / 02期
关键词：
Primordial planets; Panspermia; HGD cosmology; Solid hydrogen; Comets; Star formation; SOLID HYDROGEN; BACTERIA; CLUSTERS;
D O I：
10.1007/s10509-012-1092-8
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The space density of life-bearing primordial planets in the solar vicinity may amount to similar to 8.1x10(4) pc(-3) giving total of similar to 10(14) throughout the entire galactic disk. Initially dominated by H-2 these planets are stripped of their hydrogen mantles when the ambient radiation temperature exceeds 3 K as they fall from the galactic halo to the mid-plane of the galaxy. The zodiacal cloud in our solar system encounters a primordial planet once every 26 My (on our estimate) thus intercepting an average mass of 10(3) tonnes of interplanetary dust on each occasion. If the dust included microbial material that originated on Earth and was scattered via impacts or cometary sublimation into the zodiacal cloud, this process offers a way by which evolved genes from Earth life could become dispersed through the galaxy.
引用
收藏
页码：295 / 299
页数：5
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