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Message: <blockquote data-quote="Aexalon" data-source="post: 3581421" data-attributes="member: 16283">For the impact scenario to lower the terrain under the average elevation level (gravity-wise, not geometrically, as worlds flatten a bit since they spin), look no further than our close buddy Mars, who in its distant past got a big wallop almost (more or less) straight onto its northern pole. observe the colossal world-spanning impact basin that, on the more-or-less other side of the planet is matched by a volcanic highland and the solar system's biggest crack (no pun intended). Scale it up, add cometary ice, move closer to sun, and you'd have one very habitable pole (ok, some atmpospheric issues remain). The odds of such a thing happening on both poles of the planet are quadratically remote, of course ...Disclaimer: statements about Mars may derive from crackpot theories.For an entirely different take, look at Illuin & Ormal, the "Lamps of the Valar" in Tolkien's work, two lights on opposite sides of the world. Of course, Arda was rather flat then, so the applicability is ... limited <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=";)" title="Wink    ;)"  data-smilie="2"data-shortname=";)" /></blockquote>