I suspect the IAU in their next meeting is going to have to 're-revise' their nomenclature for what represents a 'planet'
whether it's a CLASSIC, DWARF, PLUTINO, CUBEWANO, Trans Neptunian Object, Outer Belt Object, Scattered Disk Object, Extended Scattered Disk Object, Kuiper Belt Object
etc..and that's before we even get to the EDGE of the 'Oort cloud' where there may be earth and mars-sized 'planetary bodies' in the THOUSANDS???
Here's the lastest list
(which was just updated in DECEMBER of this year!)
link
My point?
Well, if you're looking for 'pulp/sf fodder'
there's a lot of 'real estate' out there
.and not all just 'ice-cubes' or dirty snowballs. Some may have been more 'earth-like'/Mars-like
(such as Ceres might YET turn out to be) in that LIFE could have started there???? before being deep-frozen
Sedna for example
the most 'extreme' TNO goes from about 75 AU..(one AU is 93 million miles/distance from earth to sun) out to over 10,000 AU
(still short of Oort cloud boundry! and will reach closest part of orbit (perihelion about 2075
or is that 2175
before the long trip out into the dark
(wow
maybe that WAS the 'planet X' from the sf movie, 'the man from planet X!'
and they missed their chance to make the jump to a 'warmer' world????)
Maybe it was something like Space:1999 where there was a 'war' in the early solar system and planet 5 and 6, (orbiting opposite sides of the sun ala' Journey to the Far Side of the Sun/aka 'Doppelganger')
managed to blow one up and the other got thrown out of the ballpark in a long-period eliptical orbit????
Maybe there are 'intellects vast and cool and unsympathetic looking enviously' at our world from the distant, cold reaches of the solar system
.(War of the Worlds?)
Or maybe one of them is really 'MONGO' (Hail, MING!)
Or the 'lost/dying world(s)' the GREY ALIENS
whose planets started freezing when the early sun 'settled down' from it's start-up
(the inner planets would have cooled last???
Maybe there are naturally INORGANIC lifeforms
who rely on cosmic rays and superconducting temperatures to live
and they think anything above almost absolute zero is HADES???
The point is
the IAU is going to have to 'refigure' some of this stuff out, as they/scientists find even more 'worlds' out there in our own solar system
(900 planets anyone???)
and there are resources there
on site that our technology very shortly, should be able to use
(fusion based)
so that the solar system could become the next 'Oklahoma Land Rush'
The question then becomes
what if something OUT there doensn't want us on THEIR 'turf'
..(woah, Green Slime anyone
all it needed was to be closer to the SUN to thrive
it barely was surviving where it was!)
You don't have to 'invent' these worlds
they are already OUT there
and we've already seen 'cyrovolcanism' on a moon of SATURN
so we know that liquids from Methan clouds, rains, seas on TITAN to saltwater from Encedaedalus exist THAT far out from the sun
So
.?
'Not only is the Universe Stranger than we imagine, it's stranger than we CAN imagine!'
'Flash, Ahh-aaaaaaahhhhh!
Sgt DWW-btod and starry eye-stalked at the wonder of it all!