Enlightened rants...

[WinterHold]

And I'm not sure what that has to with "the observed realm is attractive to the eye", but oh well...

Curiosity is what propels mankind towards the cosmos. We do not know, but we want to know. We want to know everything that there is.
Some of us fear the unknown, some want to keep it unknown.... and some want to push the barrier of the unknown as far away as possible.
Until we know for sure, many will speculate on what will be found. If little green men, or tall grey ones... we'll see if any at all... or maybe mankind will never find out for sure... we don't know... but we'll never know, if we don't keep pushing.

The "realm" is defined to be:

realm
rɛlm/
noun
Lawarchaicliterary
noun: realm; plural noun: realms

1. a kingdom.
   "the defence of the realm"
   synonyms:
   kingdom, sovereign state, monarchy; More
   empire, principality, palatinate, duchy;
   country, land, domain, dominion, nation, province
   "his prime concern was to promote peace in the realm"
   
   
   • a field or domain of activity or interest.
     "the realm of applied chemistry"
     synonyms:
     domain, sphere, area, field, department, arena; More
     world, region, province, territory, zone, orbit
     "the realm of academic research"
     
     
     
   • Zoology
     a primary biogeographical division of the earth's surface.
     "this zoogeographical realm includes Africa south of the Atlas Mountains"
     

So it's quite obvious from the context that I was talking about number 2: you can say "the observed region-the observed world- the observed zone...etc".

Yep; that curiosity is the source of my post: where does it come from? What sparked it in our brains in the first place?
There are other unknowns that nobody wants to discover at all. That's why, "boring" exists as a word.

Space exploration requires effort, resources, sacrifice, and sometimes nothing is even discovered.
But since the days of Babel and Ancient Egyptian, rumors of a "God" or "Gods" existed, astronomy was active all the time, pick a civilization randomly, and you will always see an interest in space.