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Questions related to Kuiper Belt Objects that exist in an annulus from 30AU to approximately 50AU from the Earth's Sun.
about the lack of evidence for alien life, despite the growing evidence that suitable planets are reasonably plentiful.
Questions regarding chthonians, a hypothesised class of exoplanets that are the remnant cores of hot Jupiters.
Questions regarding Callisto, an icy moon of Jupiter.
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.