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2. If we take it as representing a sphere, we must interpret its elements accordingly. Now, the line in the lower right quadrant is straight. It could therefore mean one of two things about the sphere: either a path along the surface of the sphere or the radius of the sphere. From what we see, I can't see any reason to favor one or the other of these two meanings.
We should note, however, that it is unlikely that it indicates a point in the surface of the sphere. First, representing a point would more intelligibly be done by simply marking a dot. Second, the line runs from the center to the exterior of the sphere. That doesn't represent a dot, but rather a relation between the center and the exterior, a relation such as radius (on the assumption that the line represents something about the sphere itself rather than something about the sphere in relation to another object).
3. Perhaps the line in the lower right quadrant doesn't represent something about the sphere itself, but rather something about the sphere in relation to something else. If the line indicates a direction, that interpretation would fall into this category. OK, so is there any reason to think that this line represents something about the sphere in relation to something else? Nothing about it suggests that it does as against representing a feature of the sphere itself, but I don't think we can rule out the possibility.
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I want to build on what I said in these two sections.
I now doubt that the line in the lower right quadrant of the image points to something external to 5c.
5c is tidally locked to 5. Its orbital period is 6.6 days. Now,
if we could establish that the outer symbols indicate a relation between 5c and the other moons orbiting 5, then at some point in that period of 6.6 days we could establish a direction extending from 5c to some object in the Merope system or beyond the Merope system. Quite possibly, the quarter circumference line in the upper left quadrant indicates the bearing of the sun, which would aid in the determination of the direction of the line in the lower right.
However, this entire system is thrown by the fact that 5 orbits Merope. Regardless of the relative position of the elements in the Merope 5 subsystem, the hypothetical object indicated by the line in the lower right quadrant would be entirely dependent upon the relative position of Merope and Merope 5. Hence, when Merope 5 changes its position, the system would fall apart. This alone raises a significant doubt about the line in the lower right indicating an external object.
Yet, I note that Merope 5 has an orbital period of about 5000 days. If the line does point to something external, FDev has found a great way of establishing a reasonable period of time for us to solve the puzzle - the planet moves so slowly, we conceivable have months upon months to determine the object the line is pointing at.
However, it must be noted the the other bodies in the Merope 5 subsystem have far shorter/longer orbital periods than 5c. If the symbols in the image represent the relative positions of these other subsystem bodies, then we would have very, very few shots at establishing the correct alignment and thus very, very few shots at determining what the line points to.
So, to sum up, I think it is unlikely that the line in the lower right quadrant indicates something external to Merope 5c due to the near impossibility, given the orbital movement of the bodies in the Merope system, of establishing the correct alignment of elements within a reasonable timeframe in a game.
I need to emphasize, however, that my conclusion assumes that the symbols exterior to the "map" in the image represent the other bodies in the Merope 5 subsystem. If we remove that assumption, it is possible that the line does point to something exterior to 5c.
