Finding life elsewhere in the universe might require considering more than one “Goldilocks zone.”
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Space exploration has been a major focus of the scientific community ever since the first human was successfully put into space. Learning more about these planets, stars, and other celestial bodies has only grown the curiosity for what might exist in our universe. The biggest mystery that has yet to be solved is identifying a planet that could support human life in the ways that only Earth seems to be able to.
For a planet to sustain life, certain elements are required to be a part of the planetary composition. The primary compound that researchers look for is water due to nature's dependence on water as a biological solvent and building block for all organisms. What many individuals tend to forget is that the human body is complex and contains many necessary elements that you wouldn't think to be required for survival. "A chemical 'goldilocks zone' may limit which planets can host life" published in Science News, dives into the two biggest secondary essential elements, Phosphorus and Nitrogen.
While water is necessary for structure and function in biological systems, phosphorus and nitrogen play the vital role of composing the structure of genetic material and various proteins. The natural abundance of these two critical elements is balanced by the presence of oxygen due to how these three elements bind to iron, which is what many planet cores are made of. If more oxygen is present, iron in the mantle will bind with it, enabling more phosphorus in the mantle, but it carries nitrogen into the core. A reduction in oxygen reverses this effect, resulting in higher concentrations of nitrogen in the mantle and less phosphorus. Considering these two processes results in the "goldilocks zone", just the right amount of oxygen to keep ample amounts of both nitrogen and phosphorus available in the mantle for biological processes.
Many more elements are required for human survival, some that you would never think to consider. LibreTexts outlines in this table which elements are found in the bulk of biology, as well as macrominerals and trace elements.
Elements like magnesium are used as cofactors in over 300 enzymatic chemical reactions for energy production and protein synthesis, while calcium and phosphorus are the primary components of bone structures. Trace elements are less commonly found, but still just as important. Iron is the required metal center for heme groups that are found in blood and are responsible for oxygen transfer. The chemistry of life is far more complex than it would seem, and many factors would have to be considered when searching for a suitable planet for humans. Whether or not we ever discover a planet that checks all of these boxes remains a mystery, but that will not stop humanity from chasing the dream.
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