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A map of the surface features of something.
Questions regarding Triton, the largest moon of Neptune.
Questions about Trojan Asteroids, asteroids that co-orbit major planets.
Questions about flow regime in astrophysical gas characterized by chaotic properties.
Questions regarding a theoretical 'tunnel' through spacetime which could potentially allow time travel.
Questions related to the unit of measurement, parsec, which is approximately 3.26 times the distance of a light year.