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Questions tagged [counter-earth]

A "counter-Earth" is a planet that follows the same orbital path as Earth (or another planet), but on the opposite side of the Sun.

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Let's plot a course between Earth and Gor

We know that Gor, or Counter-Earth, is not stable in a long-term sense. Let's handwave that away, or assume that we are dealing with a temporary span of time in which the instability is immaterial. ...
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If there was a Counter-Earth on the other side of the Sun, when would it have been discovered?

Setup: We are in a alternate timeline where there is a Counter-Earth that always stays perfectly on the exact opposite side of the Sun from our Earth. It has about the same size and mass as our ...
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Could two planets follow the same orbit and never “see” each other?

Imagine two identical planets planet A and planet B, orbiting the same star. Is it possible that these two planets follow the exact same "route" as they orbit their sun, but are just distant enough ...
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How technological advanced a civilization would need to be to prove the existance of the shadow Earth?

In a short sci-fi story i am writing, Earth has a shadow twin. A planet with the same chemical/geological characteristics as Earth and wildlife very similar (but different species because evolution ...
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Duplicate Earth and Moon, where should I put it?

Duplicate Earth and Moon, where should I put it? This question partly arises from the criticisms of stories that claim a hidden planet obscured by the sun, how it would have been detected and if ...
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Making a Counter-Earth

In this question, it's pointed out that the L3 Lagrange point, where a "true" Counter-Earth would lie, is in fact unstable, and over time any object there would drift into a different orbit. ...
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What are the possibilities of a dwarf planet orbiting opposite Earth's orbit?

I am drafting a short story about a small object orbiting the Sun at the precise 'speed' as Earth's opposite the Sun, undiscovered by us due to its position. The problems I see with this include the ...