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Message: <blockquote data-quote="Steverooo" data-source="post: 1926070" data-attributes="member: 9410">In the first place, we were talking about a D&D world, with people, and all that!  Anyway, the "Life Zone" of a star is the narrow band in which temperatures are right for life.  In the solar system, most of the area inside 1 AU is *NOT* part of the Life Zone, as Sol's temperature is too high.  Mercury & Venus cannot support liquid water (and life cannot exist without it).  Outside the Life Zone, temperatures are too cold (and, again, there is no liquid water).Sure, sure, Sci-Fi is full of monsters, and a lot of speculation is done on life on Europa, or whatever, but... show me life outside the Life Zone.  Y'can't do it!  And until y'can, I don't have to believe it's possible, just 'cause some NASA scientist says that it's possible (so that he can secure funding for his latest probe).Nope, the only two places that life has ever been found are Earth/Terra (in the solar system's life zone), and Luna/Selene, our moon, also in the solar system's life zone!What?!?  You didn't know that life was found on the moon?  (True story!)  Then you were obviously born after the 1960...  When NASA went to the moon, it was with probes, first, and both Russia and the USA landed quite a few.  When Armstrong & Co. landed there, the first time, they landed within a couple of hundred yards of one of the old, non-functional probes, walked over, looked at it, disassembled one of the cameras, and brought it back to Earth...Once here, NASA scientists in the "Clean Room" were excited to find "Moon Life" in the form of bacteria growing on the lens of the camera removed from the moon probe!  Before announcements could be issued, however, it was discovered that the bacteria were terran, and had survived on the moon for over a year.  So no "Moon Life", but "life on the moon" nonetheless!  This is recorded in pU]The Encyclopedia of Astronomy & Space[/U], for the unbelievers.So, it's hard enough for life to exist at the poles, or on the water-poor moon, let alone outside the life zone.  The life zone of a star depends upon its size, temperature, spectral type, etc.  Sol is a G2 V (IIRC).  For an O, B, A, or F star, the life zone would be farther out.  For spectral types K or M, it would be closer to the sun.Also note that only Earth/Terra and Luna/Selene, our moon, are within Sol's life zone...  Mercury and Venus are too close to the sun, and Mars, the asteroids, and all the outer planets are all too far away.In general, solar systems are believed to work like this...  A few planets too hot, maybe one or two with a ghost of a chance, and then a bunch too cold.You could use magic to explain away the physics, but if you want to do that, why ask?  If you want to do physics, then life is only going to exist inside the narrow band of the life zone.  Save Pluto for the Fungi from Yuggoth and their undead servants and Byakhee!   <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f61b.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":p" title="Stick out tongue    :p"  data-smilie="7"data-shortname=":p" /></blockquote>

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