Metallicity by wizardofnoz
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Description
Habitable planets can only be found in the thin disks of Spiral galaxies which have loser arms. And these planets too must be found circling stars that have high metallicity. Metallicity in astronomy is defined as any star having elements heavier than Hydrogen and Helium. Ideally, these are Population I and some Population II type stars.
Our Sun is an Yellow Dwarf of the G2 spectral type.
Humans require 26 essential elements, while bacteria require 16. Other organisms fall within these two ranges.
Thus metallicity of a star or planet is a key index, in finding if it can have habitable life.
(Sorry, for being absent too long. Too much work. I m posting this just to let my friends know that I m still around. T4V&C)
Comments (7)
Artzy
Wonderfully Done Indeed!
ARTWITHIN
Beautiful image. I love the colors. Fascinating commentary as well, one that brings many questions to mind. One of which is...have any other planets or stars been found to have all 26 essential elements required to sustain human life, within our radius of investigation to this point?
fractalinda
Welcome back, Noel! A very interesting preface..and your image is simply amazing. Beautiful intense color, excellent hard light and awesome texture. HOT!
ppetersen
Unusual atmosphere, which gives the terrain a superb light. Love the streaks in the surface that are contrasting. Beautifully done.
wizardofnoz
Yes, Suzanne, Metallicity poses a problem for SETI propounders. Galactic pre-condition for life means either stars must be in Spiral or Spiral barred galaxies. The high metallicity star cannot be close to a nucleus or else the heavy radiation would prevent the habitability. Likewise the star cannot be on the rim, then it would have low metallicity and no possibility of life. So ideally it should be midway in the loose arms of the galaxy where star density is thin. Higher density of stars would mean the planet would not have stable orbits, making it detrimental to life. Other shockingly, and surprising matters to astronomers - Earth is the only planet with a circular orbit. The neighbouring Gas giant Jupiter also has a citcular orbit, protecting the Earth from cometary collisions and stabilizing Earth's orbit. Also the Earth's moon also plays a critical role in stabilizing Earth's axis. Wild axis swings are characteristic of planets having elliptical orbits.. No other planet in any other stellar system has has a circular orbit. Then further, Earth is the only planet with Plate Tectonics in the entire observed Universe! In fact, many astronomers, are coming to the indigestible conclusion that the earth is rarity.
theonaveen
Beautiful image and details. Great to know that the planet Earth is so very special and unique, and was designed to be that way!
lior
Excellent terrain and excellent texture too! Wishing to see you here again,the soonest possible! Have a nice evening, Lior