Earth's atmosphere is full of microbes. Could they help us find life on other worlds?

An interesting report and some important items covered in the article too, like this comment. "Then there's that water issue. Earth's clouds are special: They are the only modern atmospheric clouds in the solar system built primarily of water vapor, making them uniquely promising for life human scientists are most attuned to recognize. Venus' clouds? Sulfuric acid. Mars has some carbon dioxide wisps. Neptune's moon Triton boasts nitrogen clouds. All of them are intriguing, but no water is a real hurdle. "One of the major themes in astrobiology tends to be 'follow the water' because, for Earth-like life as we know it, water is a requirement," Gentry said. "Because those are not water-based clouds, they're not interesting for the same reason that water-based clouds are interesting."

Currently this site reports 4396 confirmed exoplanets now, http://exoplanet.eu/catalog/

and this site shows 4324 confirmed exoplanets, https://exoplanetarchive.ipac.caltech.edu/index.html

No exoplanets are confirmed presently with N2O2 atmosphere like Earth with an abundance of liquid water or clouds with water like Earth has allowing a rain cycle. Another source I use said this recently about water and abiogenesis, "In fact, water is an enemy of chemical evolution, because it hydrolyzes the large molecules needed."
 

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