Sulfuris (D5)
Planets of the Sulfuris class are rocky bodies with a dense atmosphere of carbon dioxide and sulfur dioxide, high temperatures, intense greenhouse effect, and constant volcanism.
Astronomy
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Gaïana (D4)
Gaïana-type planets are rocky worlds with a dense atmosphere of nitrogen and oxygen, allowing liquid water, an active hydrological cycle, and stable geological dynamics.
G2V-Type Star (D3)
A star of spectral type G2V is a yellow dwarf of the main sequence, powered by hydrogen nuclear fusion, characterized by its stability and energy balance.
Erythraea (D2)
Planets of the Erythraea class are desert rocky bodies with a thin carbon dioxide atmosphere, subjected to strong erosion and sharp thermal contrasts.
Asteria Planet (D1)
Planets of the Asteria class are rocky bodies without an atmosphere, exposed to large temperature variations, direct stellar radiation, and intense impact activity.
Terrestrial planet with dense atmosphere (C9)
A terrestrial planet with a dense atmosphere is a rocky body whose thick gaseous layer modifies surface temperature, pressure, and interactions with surrounding space.
Yellow dwarf star (C8)
A yellow dwarf star is a main-sequence star of medium size, whose light appears yellow due to the temperature of its surface and balanced radiation.
Non-Periodic Comet (C7)
Comet with hyperbolic or parabolic orbit that passes only once through the inner planetary system before being ejected into interstellar space by gravitational perturbations.
Hyperbolic Comet (C6)
A hyperbolic comet is an icy body whose open trajectory follows a hyperbolic orbit, causing it to pass through the Solar System without remaining gravitationally bound to it.
Long-Period Comet (C5)
A long-period comet is an icy body of the Solar System whose highly elliptical orbit takes thousands or millions of years to bring the object back near the Sun.
Short-Period Comet (C4)
A short-period comet is an icy body of the Solar System, characterized by an elliptical orbit with a return of less than two centuries, regularly approaching the Sun.
D-type asteroid (C3)
A D-type asteroid is a dark body rich in organic and volatile compounds, showing low reflectivity and primitive features close to the original materials of the solar system.
M-type asteroid (C2)
An M-type asteroid is a metallic body of the solar system, mainly composed of iron and nickel, with a reflective surface indicating a dense and differentiated composition.
S-type asteroid (C1)
An S-type asteroid is a rocky body dominated by silicates and nickel-iron, showing a relatively reflective surface and evidence of differentiated composition.
C-type Asteroid (B9)
A C-type asteroid is a carbon-rich celestial body, generally dark, composed of primitive materials, reflecting the early chemical conditions of the solar system.
Hydrothermal Moon (B8)
A hydrothermal moon is a natural satellite where the interaction between internal heat, ice, and liquid water generates hydrothermal circulations, sources of chemical exchanges and geological dynamics.
Rocky Moon (B7)
A rocky moon is a natural satellite dominated by solid mineral materials, characterized by a crust, mantle, and sometimes a differentiated core, without a significant gaseous envelope.
Icy Moon (B6)
An icy moon is a natural satellite whose surface is dominated by ice, often associated with an internal ocean, fractures, and possible cryovolcanic activity.
Volcanic Moon (B5)
A volcanic moon is a natural satellite characterized by intense internal activity, producing eruptions, lava flows, and constant transformations of its surface.
Dwarf planet (B4)
A dwarf planet is a celestial body orbiting a star, massive enough to be nearly spherical, but not massive enough to clear neighboring objects from its orbit.