'In the search for life beyond our solar system, the most promising planets might not be Earth twins,' says geochemist Stephanie Olson.
Scientists have identified more than 4,000 confirmed planets outside of our solar system. Now research suggests that some of these exoplanets may actually be more hospitable to life than Earth itself.
"For this reason, the distribution and activity of life in our ocean is controlled by ocean circulation that transport nutrient-rich waters from depth to the nutrient-poor surface," in a process known as upwelling, she said."This will be true for photosynthetic biospheres on other planets as well.
"We found that ocean circulation patterns will differ among habitable planets—and these differences may be biologically important," Olson said."High surface pressures and slow rotation rates compared to Earth enhance ocean upwelling, and thus increase the potential for nutrient replenishment. Coastal upwelling is particularly important for nutrient recycling, and so planets that lack continents might not be good places to live.
"There will always be limitations to our technology, so life is almost certainly more common than 'detectable' life," she said."This means that in our search for life in the universe, we should target the subset of habitable planets that will be most favorable to large, globally active biospheres because those are the planets where life will be easiest to detect—and where non-detections will be most meaningful.
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