Articles

172 articles

• Classification

  Erythraea

  Planets of the Erythraea class are desert rocky bodies with a thin carbon dioxide atmosphere, subjected to strong erosion and sharp thermal contrasts.

• Chemical element

  Europium

  Europium (Eu) is a chemical element of the lanthanide series (inner-transition metal) with atomic number 63 and standard atomic mass 151.964 u. This sheet describes its fundamental properties, periodic position and…

• Chemical element

  Fermium

  Fermium (Fm) is a synthetic, radioactive chemical element belonging to the category Inner transition metal (actinide), with atomic number 100 and atomic mass 257.0000 u. This sheet describes its fundamental properties…

• Chemical element

  Flerovium

  Flerovium (Fl) is a synthetic superheavy chemical element classified as a post-transition metal. It has atomic number 114 and a standard atomic mass written as [289]. This sheet describes its properties, periodic…

• Chemical element

  Fluorine

  Fluorine (F) is a halogen with atomic number 9 and atomic mass 18.9984 u. This data sheet describes its fundamental properties, position in the periodic table, and physical characteristics.

• Chemical element

  Francio

  Francium (Fr) is a highly radioactive chemical element belonging to the Alkali metal group, with atomic number 87 and an atomic mass close to 223.0000 u (corresponding to its longest-lived isotope). This sheet describes…

• Classification

  G2V-Type Star

  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.

• Chemical element

  Gadolinium

  Gadolinium (Gd) is a lanthanide (inner transition metal), with atomic number 64 and atomic mass 157.2500 u. This sheet describes its essential properties, periodic position and physical characteristics.

• Classification

  Gaïana

  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.

• Body type

  Galaxy

  A gravitationally bound assembly of stars, gases, dust, and dark matter, a galaxy forms a coherent structure often centered around a denser region.

• Chemical element

  Gallium

  Gallium (Ga) is a chemical element belonging to the category Post-transition metal, with atomic number 31 and atomic mass 69.723 u. This sheet describes its fundamental properties, periodic position and physical…

• Astronomical type

  Gas giant planet

  A gas giant planet is a massive celestial body without a solid surface, mainly composed of hydrogen and helium, with an internal structure governed by pressure and phase transitions.

• Subtype

  Gas giant planet with massive rings

  A gas giant planet surrounded by a vast ring system, where a deep fluid envelope coexists with an orbital structure made of solid particles and dispersed materials.

• Subtype

  Gas giant planet without rings

  A gas giant planet composed mainly of gases, lacking a ring system, where a deep fluid envelope and gradual internal transitions shape the structure and organize atmospheric motions.

• Chemical element

  Germanium

  Germanium (Ge) is a chemical element belonging to the category Metalloid, with atomic number 32 and atomic mass 72.6300 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

• Classification

  Gigantides

  Gigantides are giant gas planets without a defined solid surface, composed mostly of hydrogen and helium, with layered atmospheres, high wind speeds, frequent rings, and numerous satellites.

• Chemical element

  Gold

  Gold (Au) is a chemical element belonging to the category Transition metal, with atomic number 79 and atomic mass about 196.9700 u. This sheet describes its fundamental properties, periodic position and physical…

• Chemical element

  Hafnio

  Hafnium (Hf) is a chemical element belonging to the category Transition metal, with atomic number 72 and atomic mass 178.4900 u. This sheet describes its fundamental properties, periodic position and physical…

• Chemical element

  Hassium

  Hassium (Hs) is a chemical element belonging to the category Transition metal, with atomic number 108 and atomic mass 277.0000 u. This sheet describes its fundamental properties, periodic position and physical…

• Chemical element

  Helium

  Helium (He) is a chemical element belonging to the category Noble gas, with atomic number 2 and atomic mass 4.0026 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

• Chemical element

  Holmio

  Holmio (Ho) is a chemical element belonging to the category Inner transition metal (lanthanide), with atomic number 67 and atomic mass 164.9300 u. This sheet describes its fundamental properties, periodic position and…

• Chemical element

  Hydrogen

  Hydrogen (H) is a chemical element belonging to the category Non-metal, with atomic number 1 and atomic mass 1.0080 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

• Astronomical type

  Hydrothermal Moon

  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.

• Astronomical type

  Hyperbolic Comet

  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.

• Astronomical type

  Ice Giant Planet

  An ice giant planet is a massive celestial body primarily composed of water, methane, and ammonia, with a layered internal structure and a complex atmosphere.

• Subtype

  Icy giant planet with rings

  An icy giant planet surrounded by rings features a cold fluid envelope associated with an orbital structure composed of solid particles. The whole system is shaped by internal gradients and gravitational interactions.

• Subtype

  Icy giant planet without rings

  An icy giant planet without rings exhibits a cold, layered fluid envelope shaped by internal gradients, lacking any solid orbital structure. Gradual transitions determine its dynamic organization.

• Astronomical type

  Icy Moon

  An icy moon is a natural satellite whose surface is dominated by ice, often associated with an internal ocean, fractures, and possible cryovolcanic activity.

• Chemical element

  Indium

  Indium (In) is a chemical element belonging to the category Post-transition metal, with atomic number 49 and atomic mass 114.8200 u. This sheet describes its fundamental properties, periodic position and physical…

• Chemical element

  Jodo

  Jodo (I) is a chemical element belonging to the category Halogen, with atomic number 53 and atomic mass 126.9000 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

• Chemical element

  Iridium

  Iridium (Ir) is a chemical element belonging to the category transition metal, with atomic number 77 and standard atomic mass 192.2200 u. This sheet describes its fundamental properties, periodic position and physical…

• Chemical element

  Fero

  Fero (Fe) is a chemical element belonging to the category Transition metal, with atomic number 26 and atomic mass 55.8450 u. This sheet describes its fundamental properties, periodic position and physical…

• Celestial object

  Jupiter

  Jupiter is a massive body dominated by a deep fluid envelope structured into dynamic layers governed by vast circulations. Its internal transitions organize a coherent system marked by powerful fields.

• Chemical element

  Krypton

  Krypton (Kr) is a noble gas with atomic number 36 and atomic mass 83.798 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

• Chemical element

  Lanthanum

  Lanthanum (La) is a lanthanide element belonging to the rare-earth metals, with atomic number 57 and atomic mass 138.90547 u. This sheet describes its fundamental properties, periodic position and physical…

• Chemical element

  Lawrencium

  Lawrencium (Lr) is a chemical element belonging to the category Inner transition metal (actinide series), with atomic number 103 and atomic mass 262.0000 u. This sheet describes its fundamental properties, periodic…

• Chemical element

  Lead

  Lead (Pb) is a chemical element belonging to the Post-transition metal category, with atomic number 82 and atomic mass 207.2000 u.

• Chemical element

  Lithium

  Lithium (Li) is a chemical element belonging to the category Alkali metal, with atomic number 3 and atomic mass 6.9400 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

• Chemical element

  Livermorio

  Livermorio (Lv) is a synthetic, highly radioactive chemical element, probably belonging to the category Post-transition metal, with atomic number 116 and atomic mass 293.0000 u. This sheet describes its fundamental…

• Astronomical type

  Long-Period Comet

  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.