Abstract
Having reached the borders of the solar system, there is bound to be a desire to lean on the fence, even if there is no one out there, and to look outwards, and, while having a look around, to wonder what might lay beyond. After all, this is the first time we have arrived at this spot.
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Bignami, G.F. (2015). The Sphere +4 (or the Fixed Stars). In: The Mystery of the Seven Spheres. Springer, Cham. https://doi.org/10.1007/978-3-319-17004-6_9
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DOI: https://doi.org/10.1007/978-3-319-17004-6_9
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