Has Earth Splattered Life All Over the Solar System?

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Researchers believe that it is more than likely that rock capable of carrying life, from both Earth and Mars, has been spewed out in to all the terrestrial planets in the Solar System and Jupiter, and transfer from Earth to Saturn is also probable. If someone from Saturn sues you for child support, don't say we didn't warn you. 
 
It's called lithopanspermia, sowing your wild oats through the universe through rocks to the layman. The research is based on an analysis of the effect of astroids hitting our planet for the last 3.5 billion years and sending chunks of life attached to Earth rocks out into space. The researchers at Penn State University, say that their results indicate that transfer of life cannot be ruled out, and searches for life on other bodies in our solar system should keep in mind the necessity of determining whether life arose independently or descended from common ancestors to life that originated here on Earth. Thus, any life found in other parts of the solar system cannot be assumed to be of independent origin.
 
The probability of life surviving being smashed around space and other heavenly bodies is beyond the scope of this research. However,Titan, Europa, and Callisto all indicate significant liquid water oceans beneath the surface meaning that life would be sustainable on these planets, in theory. Europa currently presents the thinnest surface ice layer, which provides less of a barrier for life to eventually find its way through, especially when considering the “chaos regions” that indicate recent partial melting. 
 
On Europa, some parts of the ice sheet sometimes break into large chunks separated by liquid water, which later refreezes. Any meteorites lying on top of the ice sheet in a region when this occurs would stand a chance of falling through. Additionally, the moons are thought to have been significantly warmer in the not-too-distant past. Titan currently has a roughly 50 km thick crust, but the moon only cooled enough to form this shell after 4 Gyr, before which it had only a few kilometers of methane clathrate over the surface, allowing a significant time in which life could have more easily penetrated into the liquid water ocean. 
 
Jupiter's moons are also believed to have been significantly warmer in the past, due to both residual heat of formation and their slow outward migration, making them previously subjected to stronger tidal heating from Jupiter.
 
Ultimately, the researchers conclude that the possibility of transfer of life from the inner Solar System to outer moons cannot be ruled out based on current knowledge. Any planned missions to search for life on Titan or the moons of Jupiter will have to consider whether any biological material found represents an independent origin, rather than another branch in the family tree populated by Earth life.
 
The researchers, led by astrobiology student Rachel Worth, ran mathematical models in computer simulations to reveal what may have happened to chunks of Earth debris. The simulation tabulation below shows how many 3 meter rocks were possibly transferred from Earth to Saturn, for example (that number is 14,000 give or take 8,000). Three meters is the minimum diameter of rock that would have been able to sustain life and shield it from the rigors of this kind of violent space voyage.  
 

Table 4. Probabilities and Estimated Viable Transfers to the Planets in the Solar System

 
    Probability (%) 3.5 Gyr total Mass (kg) transferred
from Earth Orbit 40±0.3 80,000,000±600,000 2.7×1013
  Sun 1.5±0.06 3,000,000±100,000 1.0×1012
  Mercury 0.37±0.03 730,000±60,000 2.5×1011
  Venus 13±0.2 26,000,000±300,000 8.9×1012
  Earth 40±0.3 79,000,000±600,000 2.7×1013
  Mars 0.18±0.02 360,000±40,000 1.2×1011
  Jupiter 0.041±0.01 83,000±20,000 2.8×1010
  Saturn 0.0069±0.004 14,000±8,000 4.7×109
  Ejected 5±0.1 10,000,000±200,000 3.4×1012
from Mars Orbit 75±0.4 600,000,000±3,000,000 2.0×1014
  Sun 1.3±0.06 10,000,000±300,000 3.4×1012
  Mercury 0.03±0.009 240,000±50,000 8.1×1010
  Venus 1.5±0.06 12,000,000±400,000 4.1×1012
  Earth 2.6±0.08 21,000,000±500,000 7.0×1012
  Mars 16±0.2 130,000,000±1,000,000 4.3×1013
  Jupiter 0.04±0.01 320,000±60,000 1.1×1011
  Saturn <0.0025 <20,000 <6.8×109
  Ejected 3.8±0.1 31,000,000±600,000 1.0×1013

The 3.5 Gyr total is the number of transferred objects we expect. Mass transferred assumes each object is 340,000 kg (i.e., a 3 m sphere with density of 3 g/cm3). No Mars-to-Saturn transfers were seen in the simulations, so we show the upper limits.

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