XPost: sci.physics.relativity   
   From: PointedEars@web.de   
      
   [X-Post & F'up2 alt.astronomy]   
      
   Ross Finlayson wrote:   
   > On 01/07/2026 08:00 AM, cld wrote:   
   >> Our solar system should have a name, to distinguish it from all the   
   >> other solar systems.   
   >   
   > It's usually called "the Terran" or "Terra".   
      
   No.  "Terra" is a (arguably a mostly language-neutral, thus astronomically   
   more feasible) name for the planet that is called "Earth" in English instead.   
      
   > We live on Terra-prime or Terra-3, it's called Earth,   
      
   No, the Sol(ar) System is NOT called "Earth".  "Earth" is the name for a   
   planet, NOT a planetary system.   
      
   "Terra-3" is NOT proper astronomical naming.  Planets are numbered after the   
   stars that they orbit, from closer to it than farther away from it, and one   
   uses _Roman_ numerals to number them.  The star that Terra orbits is Sol, so   
   the correct designation for the former would be "Sol III".   
      
   "Terra Prime" instead is a name used *in science-fiction and fantasy* to   
   refer to Earth as the home planet of humans, indicating that there is a   
   similar planet either in our universe (sometimes called "Earth 2") or in   
   parallel universes in which sometimes the story happens as well.   
      
   > Most solar systems are distinguished by numbers.   
      
   There is only one Sol(ar) System.  Other planetary systems, i.e. systems of   
   exoplanets, are typically named after their primary (star) which in turn is   
   often named after the astronomical project/group that investigated it and,   
   perhaps, the respective planetary system, too.  For example, TRAPPIST-1 is a   
   star (the first one) that was investigated by a Belgian team of astronomers   
   (who, tongue-in-cheek, chose an acronym such that it would refer to the   
   renowned Belgian beer style as brewed by and after the fashion of the   
   Trappists, an order of Catholic monks).   
      
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   PointedEars   
      
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