Habitable Planets Will Most Likely be Cold, Dry 'Pale Yellow Dots' - by spacewriter
Terrestrial-type habitable planets can evolve in three scenarios of land/ocean distribution: covered by lands, oceans, or an equal mix of both. The land-covered planet is the most probable scenario , while our “equal mix” Earth is even more unique than previously thought. Modelling shows that the probabilities of three very-different looking types of terrestrial planets vary widely, and impact their climate and habitability. Credit: Europlanet 2024 RI/T. Roger.
“We Earthlings enjoy the balance between land areas and oceans on our home planet, said Spohn, who is executive director of the International Space Science Institute in Bern, Switzerland. “It is tempting to assume that a second Earth would be just like ours, but our modeling results suggest that this is not likely to be the case.”So, why would habitable planets be so different from Carl Sagan’s “pale blue dot”? The “look and feel” of each exoplanet depends on various characteristics.
Geology also plays an important role, according to the researchers. The main driver of Earth’s plate tectonics is internal heat. “That drives geologic activity, such as earthquakes, volcanoes, and mountain building, and results in the growth of continents,” Spohn said. “The land’s erosion is part of a series of cycles that exchange water between the atmosphere and the interior.
The planets with less than 30 percent oceans would have colder temps and dryer climates. They might have cool deserts and possibly some ice sheets. We know from similar regions here on Earth that life can thrive in such environments. Here’s another intriguing thought. The Earth we know today is different from how it was at various other stages in its history. For example, there could be worlds with conditions similar to those our planet endured during the Ice Ages. Life did flourish here during those times, and such a world would be quite habitable. Interestingly, people who lived on our planet during that time 10,000 years ago would find these places comfortable and familiar..
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