I-Search Second Source

1) The keywords used to find the source: Planet, Habitable, and Conditions

2) MLA Citation:

•          Lammer, H., et al. “What Makes a Planet Habitable?” Astronomy & Astrophysics Review, vol. 17, no. 2, June 2009, pp. 181–249. EBSCOhost, doi:10.1007/s00159-009-0019-z.

 https://search.ebscohost.com/login.aspx?direct=true&db=a9h&AN=40829609&site=eli-live&scope=site

3) My Abstract: 

                This work audits factors which are basic for the advancement of tenable Earth-like planets, for example, the impacts of the host star subordinate radiation and molecule motions on the improvement of airs and introductory water inventories. Likewise talks about on geodynamical and geophysical situations which are essential for planets where plate tectonics stay dynamic over geographical time scales and for universes which develop to one-plate planets. Class I environments speak to bodies on which outstanding and geophysical conditions permit Earth-simple planets to grow so intricate multicellular living things may start. Class II living spaces incorporate bodies on which life may develop however because of excellent and geophysical conditions that are not the same as the class I territories. Class III natural surroundings are planetary bodies where subsurface water seas exist which cooperate straightforwardly with a silicate-rich center, while class IV territories have fluid water layers between two ice layers or fluids over the ice. Besides, we examine from the present perspective of how life may have begun on early Earth, the potential outcomes that life may advance on such Earth-like bodies and how future space missions may find indications of extraterrestrial life.

4) Points from my search :

      

• Habitable conditions in a Planet. When astrobiologist evaluates a planet, they look not just at its current situation, but for signs that it could have been habitable in the past. But as an abandoned house might be perfectly suitable to live in (habitable), this does not necessarily mean somebody is living in it. The question to ask regarding celestial bodies is not only “Is it habitable?”, but also “Could life have originated and evolved there?
  
• The large quantities of extraterrestrial material delivered to young planetary surfaces during the heavy bombardment phase may have played a key role in life’s origin.
                                                                                                       ---(Chyba and Sagan 1992).
  
• Building blocks of life should be available on every planetary system. After the planets have formed the molecules necessary for survival are delivered by meteorites and comets to these new planets. Depending on the environmental conditions and the time-span where these conditions ( water, temperature, atmospheric pressure) remain non-destructive to the delivered molecules, life may origin like it did on Earth early.