History Main / CounterEarth

** In the first few appearances of ''Superman'', Krypton itself was in fact this. Presumably the writers believed even Krypton-level spaceflight technology would only be able to get that far...

* In ''Film/WarningFromSpace'' (a.k.a. ''Mysterious Satellite''), "Planet 'R'" is on a collision course with Earth. One-eyed, starfish-shaped aliens from the counter-Earth Paira take on human forms to warn the earth about the impending disaster.

* In ''Film/AnotherEarth'' a second earth appears in the solar system, drifting towards ours. There are no dangerous implications. [[ArtisticLicensePhysics Any actual physics is ignored]] as [[Administrivia/TropesAreTools this movie is about grief and second chances]], not science.
* In ''Film/{{Melancholia}}'', the counter-earth planet Melancholia in on collision course with Earth, but is first believed to be simply passing by.

* The Cybermen in ''Series/DoctorWho'' came from Mondas, a double of Earth. It was not on the other side of the sun in the episode. It originally was in the same vicinity as Earth, until ''something'' happened, shoving Mondas out of its gravitational pull and hurtling it out towards the outskirts of the solar system (what today is called the Kuiper Belt). The people there cyberized themselves to survive, and then tried to move their planet back into place in the solar system, which is where the audience sees them in their first appearance. The Audio Play ''Spare Parts'' revealed that the moon entering Earth's orbit destabilized the gravitational balance between Earth and Mondas, and it wasn't until this happened that Mondas's inhabitants became aware of Earth, neatly creating an InvertedTrope.

Wiki/TheOtherWiki [[http://en.wikipedia.org/wiki/Fictional_planets_of_the_Solar_System#Counter-Earth has a list.]]

** A Counter-Earth created by the Earth scientist, The High Evolutionary used to be there. He wanted it to be ''better'' than the real Earth, but one of his earlier creations, the Man-Beast, corrupted it. The High Evolutionary almost destroyed it in his disappointment, but the space hero [[ComicBook/{{Warlock}} Adam Warlock]] asked for the chance to save it, and was granted it. (If that sounds like a [[WhatDoYouMeanItsNotSymbolic Christ analogy]], it's because it ''was''). The planet was eventually removed from the Solar system by SufficientlyAdvancedAliens and placed in a museum. The ''WesternAnimation/SpiderManUnlimited'' TV series and the associated comic book took place on that one. The comic was not in-continuity with the rest of Marvel's comics however.

In RealLife, this idea has been proven false, even before the Space Age. A Counter-Earth's gravity would affect the motion of other planets, and other planets' gravity would cause it to drift out of its position, and the final blow was when probes actually went the other side of the Sun from us and didn't see any counter-earths. [[Administrivia/TropesAreTools It's still an exciting idea for fiction, though.]]

Wiki/TheOtherWiki [[http://en.wikipedia.org/wiki/Fictional_planets_of_the_Solar_System#Counter-Earth has a list]].

[[JustForFun/IThoughtItMeant Not related to]] [[Webcomic/EightBitTheater blocking]] [[http://www.nuklearpower.com/2009/09/08/episode-1170-happy-landings/ the ground]].

A hypothetical planet on the other side of the Sun from the Earth which is usually like the Earth, but hidden. The idea was popular in old science fiction, and continues to appear in sci-fi that is [[MohsScaleOfSciFiHardness not very hard]].