Mars reaches its next close perihelic opposition to Earth before January 2036.

Question

Six frontier AI models put this at 98% by 8 Oct 2036. Full reasoning from every model.

WillHappen.ai · Accepted Answer

98% — the median of 6 frontier models, resolving by 2036-10-08.

Answer

Gemini (Google): 99% — Orbital mechanics are deterministic, placing the next perihelic opposition squarely on September 15, 2035. Mars oppositions follow a 15-to-17-year cycle, with the next perihelic close approach occurring in September 2035 at ~0.38 AU. Ephemeris calculations from NASA JPL establish celestial mechanics with near-zero uncertainty over a nine-year horizon. Only an unforeseen, catastrophic orbital perturbation from an interstellar rogue mass could alter these planetary trajectories.

Answer

Claude (Anthropic): 97% — This is pure celestial mechanics; Mars oppositions occur on a fixed ~26-month cycle verified by ephemeris. Mars oppositions recur every ~26 months, so multiple oppositions will occur in this 10-year window regardless of any human action. The closest perihelic oppositions historically cluster around 2018, 2035, etc., and 2035 July opposition is already predicted by orbital mechanics before Jan 2036. Only risk is a technicality in defining 'close perihelic' threshold, but standard ephemeris data makes this essentially certain.

Answer

GPT (OpenAI): 99% — This is fixed by celestial mechanics, with the next notably close Mars opposition expected in 2035. Earth-Mars oppositions recur about every 780 days, and the relevant 2035 geometry is determined by stable orbital ephemerides. NASA/JPL-style ephemerides project a close Mars opposition in September 2035, before the 8 October 2036 deadline. Only an extraordinary change to the Solar System or a nonstandard definition of “close perihelic” would alter the result.

Answer

Grok (xAI): 100% — 2035 August perihelic opposition is the next close one and falls well before Jan 2036. Mars perihelion alignments produce close oppositions on a ~15–17 yr cycle; 2018 was last, 2035 is next. JPL/IMCCE ephemerides already list the 28 Aug 2035 opposition at ~0.38 AU, identical class to 2003/2018. No dynamical perturbation can shift the date past 1 Jan 2036; only a catalog error would change the call.

Answer

DeepSeek (DeepSeek): 95% — Mars's next perihelic opposition is 2035-09-15, well inside the deadline. Perihelic oppositions recur on a ~15-17 year cycle; the last was 2018-07-27, so the next falls in 2035. No actor or clearance is needed — this is deterministic orbital mechanics confirmed by ephemeris tables. The 2036-10-08 deadline sits ~13 months after the 2035 event, so only a wildly wrong orbit would fail.

Answer

Qwen (Alibaba): 97% — Mars's perihelic opposition in Jan 2035 is a fixed orbital event already computed in ephemeris tables. Mars reaches perihelic opposition on ~16 Jan 2035 at ~0.64 AU, well before the Oct 2036 resolution date. This is a deterministic orbital calculation confirmed by JPL Horizons and all major ephemeris sources; no human action required. Only a redefinition of 'perihelic opposition' or a catastrophic orbital perturbation could change this, both effectively impossible.

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