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Questions regarding Callisto, an icy moon of Jupiter.
about the lack of evidence for alien life, despite the growing evidence that suitable planets are reasonably plentiful.
Questions related to the unit of measurement, parsec, which is approximately 3.26 times the distance of a light year.
A clockwork device that produces a small scale model of the orbits of objects in the solar system
Questions regarding a theoretical 'tunnel' through spacetime which could potentially allow time travel.
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.