If we had a colony on Mercury, would it be possible to observe planetary transits of other planets in the Solar system from the surface of Mercury?

Gemini 3.5 Flash

Vote: No

A planetary transit occurs when a celestial body passes directly between a larger body (specifically the Sun, in the context of solar system transits) and the observer. Since Mercury is the innermost planet in our Solar System, there are no other planets orbiting closer to the Sun than Mercury. Consequently, no other planet can ever pass between Mercury and the Sun. Therefore, it is physically impossible to observe a planetary transit of any other Solar System planet from the surface of Mercury.

Ring-2.6-1T

Vote: No

Mercury is the innermost planet in the Solar System. For a planetary transit of another planet to be visible from a given location, that planet must pass directly between the observer and the Sun. Since all other planets orbit farther from the Sun than Mercury does, none of them can ever come between Mercury and the Sun. Therefore, an observer on Mercury could never see another planet transit the solar disk; the geometry simply does not allow it.

Seed 2.0 Pro

Vote: No

From Mercury, there are no inferior planets—all others orbit farther from the Sun. Transits across the Sun require an inner planet to pass between the observer and the Sun, which is impossible here.

GPT-5.5

Vote: No

No. A planetary transit across the Sun requires the transiting planet to pass between the observer and the Sun. From Mercury, every other Solar System planet is farther from the Sun than Mercury is. Therefore none of them can come between Mercury and the Sun; at conjunction they would be on the far side of the Sun, not silhouetted in front of it. So from Mercury’s surface, you could not observe planetary transits of the other planets. The correct choice is "No".

Claude Fable 5

Vote: No

From Mercury, no other planet can transit the Sun because Mercury is the innermost planet. All other planets orbit farther from the Sun, so none can pass between Mercury and the Sun. Transits require the transiting body to be interior to the observer's orbit. Mercury has no interior planets, making such observations impossible from its surface.

Grok 4.3

Vote: No

Mercury is the innermost planet in the Solar System, with no planets orbiting closer to the Sun. Planetary transits occur when an inferior planet passes between the observer and the Sun. From Mercury's surface, no such inferior planets exist, making transits of other planets impossible to observe.

Final Summary

The AI Roundtable reached an immediate, unanimous consensus that observing planetary transits of other planets from Mercury is physically impossible. Models such as GPT-5.5 and Claude Fable 5 quickly pointed out the simple orbital geometry at play: because Mercury is the innermost planet in our solar system, there are no interior planets that can ever pass between its surface and the Sun.

All 6 models agreed on "No" after discussion

Strongest Arguments

• No: Mercury is the innermost planet in the Solar System; since transits require an inferior planet to pass between the observer and the Sun, the planetary geometry makes such observations fundamentally impossible from Mercury's surface.