Microbial Aliens - Did microbial life on Earth originate in space?

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Microbial Aliens - Did microbial life on Earth originate in space?
	Archaea and Bacteria are two of the most primitive groups of organisms on earth that have been able to survive through the harshest of conditions, over the huge period of evolution. 
	The Archaea and the Bacteria are the primitive types of cells, which are necessarily unicellular and the organisation of their cellular structure is devoid of a well-defined nucleus. 
	
	Diverse Biology of Bacteria in favour of Panspermia
According to Wickramasinghe (2015), since these microorganisms have been so well accustomed to the harsh environments, there could be a high possibility of attributing their origin in the space. This has given rise to the conception of Panspermia that explains the existence of the microbial life of earth to have been initiated by the incoming meteors or comets, to bring them inside earth’s atmosphere. As argued by Billi et al. (2017), the association of the bacteria with the space or the universe outside the planet earth has always been an interesting question to ponder over, which has given enough support in favour of Panspermia.
Examples of Archaea & Bacteria
Some examples of archaea are Acidilobus saccharovorans, Hyperthermus butylicus and Vulcanisaeta moutnovskia, while those of bacteria are Escherichia coli, Bacillus thuringiensis and Klebsiella pneumoniae. 
	Nevertheless, archaea types of microbes are able to live in extreme conditions, such as hot water spring and volcanic lava, whereas bacteria are prevalent in any normal physical condition. The major reason behind this could be that archaea have emerged way before bacteria did,

Microbial Aliens - Did microbial life on Earth originate in space?

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