=Tyche (50,000 AU)= 
Discovered before the Fall, Tyche is a “cold Jupiter” that orbits the sun with a perihelion of 50,000 AU. Pre-Fall myths held that Tyche was the fabled planet Nibiru, believed by UFOlogists and end-time prophesies to be responsible for the end of life on Earth. Because of its remoteness, only a single probe has been sent to Tyche, and the results brought more questions than answers.
The planet challenges current categorizations of exoplanets. Its mass is four times that of Jupiter, but its volume is one ﬁfth, with an average atmospheric temperature of –261 C. It is veiled in a heavy, murky ammonia atmosphere that blocks visual observations beyond a few hundred kilometers. Given its density, the core of the planet is believed to either be much larger than any previously discovered gas giant or containing an inordinate amount of heavier elements.
The planet is subject to near-continuous observations. [[Argonauts]] have sent a pair of probes, but neither will reach Tyche for several decades yet. Despite the attention, Tyche has kept its secrets well.

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