18 to 23, and the findings are described in the team's conference abstract.įollow Keith Cooper on Twitter Follow us on Twitter and on Facebook. The results were presented at the European Science Congress, which took place in Granada, Spain, from Sept. However, Abe's study, along with others, agrees with Spohn and Höning's conclusion that land-dominated planets would be far more common than Earth-like or water-rich planets.Ĭonsequently, instead of looking for Carl Sagan's quintessential " pale blue dot," astronomers should be searching habitable zones for "pale yellow dots." And perhaps the most famous study of land planets, led by Yutaka Abe of the University of Tokyo in 2011, found that land planets can remain habitable across much wider distances from their star than water worlds can and that they don't freeze over as fast because there is less water for ice and snow. For example, a study by Evelyn MacDonald of the University of Toronto found that for tidally locked worlds, the more land there is, the greater the average surface temperatures in general, previously reported. Spohn and Höning's results differ slightly from those of other research teams, however. Blue Planet II Is the Greatest Nature Series Of All Time theatlantic 213 38 comments Best Add a Comment AKAkorm 5 yr. Many nearby Earth-size exoplanets could be hiding in plain sight What really makes a planet habitable? Our assumptions may be wrong On these land-dominated planets, cold deserts would stretch across the landmasses, and vast glaciers and ice sheets would be common. BBC America: Memorable moments from this bold cinematic experience which took viewers on a magical adventure across the greatest, yet least known, parts of our planet - our oceans. The models indicated that ocean-dominated planets with less than 10% land would likely be warm, with moist atmospheres and tropical climates, whereas land-dominated worlds with less than 30% of their surfaces covered in ocean would be colder, drier and harsher than their ocean-dominated counterparts. Planet Earth: The Best of Blue Planet II. "Their fauna and flora may be quite different," Spohn said. They found that, while both land- and ocean-dominated planets could still be habitable, with similar temperatures if all else were equal, their life-forms and climates might not be quite unlike Earth's. Spohn and Höning also considered other factors, such as how the outgassing of carbon dioxide (a greenhouse gas) contributes to the carbon-silicate cycle that acts as a planet's long-term thermostat controlling the climate over millions of years. Our numerical models of how these cycles interact show that present-day Earth may be an exceptional planet."Įarth as a "pale blue dot" seen by Voyager 1 in 1990. On the other hand, "The land's erosion is part of a series of cycles that exchange water between the atmosphere and the interior. "In the engine of Earth's plate tectonics, internal heat drives geologic activity, such as earthquakes, volcanoes and mountain building, and results in the growth of continents," Spohn said. ago Those who have watched both, is this better than Planet Earth II I was pretty amazed at the way they were able to shoot real animals in a way that made them seem like they were acting out a movie script in PEII. Other planets could have reached this tipping point much sooner. 'Blue Planet II' Is the Greatest Nature Series Of All Time theatlantic 213 38 comments Best Add a Comment AKAkorm 5 yr. However, over billions of years, even Earth's fine balance is unstable, although we don't notice it because the rates of change are small, Spohn said. How well subduction zones at the boundaries between tectonic plates can cycle water over land at this mantle temperature dictates whether a planet will be dominated by land or ocean.Įarth reached these conditions about 2.5 billion years ago, at the end of the Archean, and our planet found the delicate balance we live in today. Spohn and his collaborator, Dennis Höning, a postdoctoral researcher at the Potsdam Institute for Climate Impact Research in Germany, concluded that the most likely time for this tipping point to occur is when a planet's interior has cooled close to the temperature of Earth's mantle, which is 2,570 degrees Fahrenheit (1,410 degrees Celsius) near the crust and as hot as 6,700 F (3,700 C) at greater depths. contains backups of every video posted to the youtube channel.The results indicate that Earth's ratio of land to sea (1:3) is finely balanced and that for most planets, this ratio can easily tip over into mostly land or mostly sea. Planet Earth II and Blue Planet II: The Collection 4K Blu-ray 4K Ultra HD + Blu-ray BBC 2016 - 2017 2 Movies Rated BBFC: 12 Large: Front Slip Add to collection. is the home of movie reviews by /u/anunkindness. If you want to hide spoilers we use the (/spoiler) format. We have an official discord- Which can be found here
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |