Seems like the Pangea hypothesis might have gotten some evidence... wouldn't 
say this is conclusive though, but it is intriguing.
Scientists claim discovery of life coming to Earth from space
Scientists from the University of Sheffield believe they have found life 
arriving to Earth from space after sending a balloon to the stratosphere.’
After it landed, scientists discovered that they had captured a diatom fragment 
and some unusual biological entities from the stratosphere, all of which are 
too large to have come from Earth.
Other scientists disagree, as noted here: New Alien Life Claim Far from 
Convincing, Scientists Say
The team, led by Professor (Hon. Cardiff and Buckingham Universities) Milton 
Wainwright, from the University’s Department of Molecular Biology and 
Biotechnology found small organisms that could have come from space after 
sending a specially designed balloon to 27km into the stratosphere during the 
recent Perseid meteor shower.
Professor Wainwright said: “Most people will assume that these biological 
particles must have just drifted up to the stratosphere from Earth, but it is 
generally accepted that a particle of the size found cannot be lifted from 
Earth to heights of, for example, 27km. The only known exception is by a 
violent volcanic eruption, none of which occurred within three years of the 
sampling trip.
“In the absence of a mechanism by which large particles like these can be 
transported to the stratosphere we can only conclude that the biological 
entities originated from space. Our conclusion then is that life is continually 
arriving to Earth from space, life is not restricted to this planet and it 
almost certainly did not originate here.”
Professor Wainwright said the results could be revolutionary: “If life does 
continue to arrive from space then we have to completely change our view of 
biology and evolution,” he added. “New textbooks will have to be written!”
Professor Wainwright said stringent precautions had been taken against the 
possibility of contamination during sampling and processing, and said the group 
was confident that the biological organisms could only have come from the 
The group’s findings have been published in the Journal of Cosmology (open 
access) and updated versions will appear in the same journal, a new version of 
which will be published in the near future. Professor Chandra Wickramasinghe of 
the Buckingham, University Center for Astrobiology (of which Professor 
Wainwright is an Honorary Fellow) also gave a presentation of the group’s 
findings at a meeting of astronomers and astrobiologists in San Diego last 
Professor Wainwright added: “Of course it will be argued that there must be an, 
as yet, unknown mechanism for transferring large particles from Earth to the 
high stratosphere, but we stand by our conclusions. The absolutely crucial 
experiment will come when we do what is called ‘isotope fractionation’. We will 
take some of the samples which we have isolated from the stratosphere and 
introduce them into a complex machine – a button will be pressed. If the ratio 
of certain isotopes gives one number then our organisms are from Earth, if it 
gives another, then they are from space. The tension will obviously be almost 
impossible to live with!”
The research was conducted by Professor (Hon. Cardiff and Buckingham 
Universities) Milton Wainwright from the University of Sheffield, Chris Rose 
and Alex Baker from the University of Sheffield’s Leonardo Centre for Tribology 
and Professor Chandra Wickramasinghe Director of the Centre for Astrobiology, 
University of Buckingham.

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