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The bacteria they are unicellular organisms that have no nucleus protected by an external wall; common in any terrestrial environment, including the most extreme.

Therefore, it is considered probable that the first living organisms on earth were similar to modern archaea (single-celled microorganisms) and that it is likely to find similar life forms on other planets or smaller celestial bodies.

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Astronomy Glossary: ​​BBaikonur (O Baykonur)