There is no topological model which can easily account for what astronomers at the University Beneath Chicago have observed under the ice of Jupiter's sixth moon. Though its surface is indeed a sphere, with a finite diameter around three-thousand kilometers, Europa’s volume is infinite.
“The moon’s core is a hole, as far as we can tell; one which leads downward in all directions." Thus explains Dr. Gabriel Toriano, professor of Applied 'Pataphysics at the University’s Department of Mathematics. "That might seem remarkable to someone unacquainted with the subject matter, but we actually find that such things are quite normal when it comes to the study of bottomless pits. In order for them to exist on a spherical planet, they must lead downward from all possible entry points. What's most remarkable about Europa, however, is that somehow, this bottomless pit has been filled in.”
Indeed, Europa has long been considered one of the most likely homes for extraterrestrial life within the solar system, largely due to the vast ocean of liquid water hidden beneath its frozen surface. Finding that life may prove difficult, however, as this ocean has been shown to be bottomless. It is possible to dive through the moon’s core and continue indefinitely deeper without ever reaching the other side. The waters only grow darker, colder, and more dense the further one descends, until they find themselves in an environment even more hostile than the void above.
Despite this moon’s apparently infinite volume and mass, it still only produces a finite amount of gravitational pull. Most matter that can be found deeper than the core has a negligible effect on external bodies, largely due to the inverse square law that governs gravity’s strength. As such, nothing about Europa that can be seen through a telescope betrays the impossibility of its nature; it is only after in-depth analysis of its geological properties that this anomaly becomes clear.
"Given the moon’s curious nature,” Dr. Toriano continues, "It is altogether possible that, if there is any life to be found within Europa, that it is still further away from us than the nearest star system with surface life comparable to our own. It's also possible, and even probable, that there are things lurking within Europa's ocean which are larger than Europa itself."