Petrus is a natural satellite of Aero (Terra II), United Empire of Earth (UEE). Irregularly shaped, pockmarked with craters, and following an inclined orbit, Petrus may possibly be a remaining piece of a once larger celestial body.
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- Aero is a mesoplanet in the Terra system, United Empire of Earth (UEE). Orbiting closest to the system's sun, its surface is too dangerous for any Humans to venture upon for any great lengths of time ...
- The Terra system is a planetary system in the United Empire of Earth (UEE) made up of one mesoplanet, one terrestrial planet, two super-Earths, and one G-type star named Terra Nova. Located at the nex...
- Petram is a captured carbonaceous asteroid, one of two natural satellites of Aero (Terra I), United Empire of Earth (UEE). It orbits closer to Aero than its sister moon, Petrus.
