Far from our solar system, phosphorus surrounding distant stars could be a telltale sign of worlds friendly to extraterrestrial life. Is phosphorus around exoplanets a sign of life-friendly worlds? By examining the chemical composition of stars known to host exoplanets, it may be possible to determine which solar systems are likely to house alien lifeforms. Life on Earth depends on the presence of six key ingredients — carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur (known as CHNOPS). Of these, phosphorus is the rarest on Earth, making it the limiting ingredient for the chemical reactions of life. This week, we are…
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