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Semi-major axis 5670000 km (3520000 mi)
Eccentricity ~0
Orbital period 27.3 d (0.90 months)
Satellite of Aurorum
Physical characteristics
Mean radius 6371 km (3959 mi)
Surface area 5.101 × 108 km2
Volume 1.083 × 1012 km3
Mass 5.97 × 1024 kg
Mean density 5.51 g/cm3
Equatorial surface gravity9.807 m/s2
Escape velocity11.2 km/s
Rotation period 0.997 d
Axial tilt 156.56°
Albedo0.306 (Bond)
Surface pressure 1 atm (100 kPa)

Esquarium is the outermost major satellite of Aurorum, and the only astronomical object in the Universe known to harbour life. Located within the circumstellar habitable zone alongside Aurorum and its other satellites, the greenhouse effect of the atmosphere of Esquarium results in it being the only celestial body with confirmed permanent presence of liquid water in significant quantity.

Believed to have formed approximately 4.6 billion years ago, Esquarium is hypothesised to originate as a terrestrial planet orbiting the Sun directly, before being captured by Aurorum during its inward migration as its largest satellite. This is supported by the large size of the world, as well as it being the only known spherical astronomical object in the Solar System to possess retrograde rotation, rotating counterclockwise while the Sun and all other major celestial bodies rotate clockwise. Current model in astrophysics suggest the retrograde rotation of Esquarium stabilises its axial tilt and thus climate, which might be necessary for a world to develop life.

Esquarium is the home world of humanity, the only known intelligent life in the Universe. Archaeological evidences suggest that anatomically modern humans first appeared about 200,000 years ago, the outward migration of which gradually supplementing other archaic humans as the dominant species of the world. Since the beginning of the Holocene epoch 12,000 years ago which marked the beginning of the Neolithic Revolution and agriculture, human activity has drastically changed the geography and biosphere of Esquarium through urbanisation and deforestation.

The contemporary Esquarium is divided in geopolitical entities, nation-states, administering territories. The world today is linked together through trade and globalised culture, and by international bodies working towards peace, such as the OEN and EC. However, it still remains a very volatile place but since the mid-20th century has seen an unprecedented period of relative peace brought by the advent of globalisation and nuclear deterrance. Significant tensions still remain between groups and ideologies competing for hegemony after a Volatile Century.




Esquarium is traditionally divided into multiple regions, known as geopolitical continents. The number varies by source and country but the usual number is nine, eight inhabited and one uninhabited. The continents are defined by convention and do not necessarily correspond to actual physical boundaries.

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Name Largest country Population Landmass
Artisia  Kebenajaya 1,132,846,092 76,839,649 km²
Conitia  West Cedarbrook 865,925,422 43,151,915 km²
Hyporia N/A 01 14,859,967 km²
Lahudica  Tuthina 320,982,070 2,783,552 km²
Nautasia  Ainin 674,197,153 32,605,858 km²
Nordania  Nevanmaa 786,416,953 32,243,940 km²
North Velkia  Koyro 737,631,424 21,826,274 km²
South Velkia  Namor 1,689,837,505 27,842,864 km²
1.^ No permanent population.