Articles

172 articles

• Chemical element

  Rhodium

  Rhodium (Rh) is a chemical element belonging to the category Transition metal, with atomic number 45 and atomic mass 102.9100 u. This sheet describes its fundamental properties, periodic position and physical…

• Astronomical type

  Rocky Moon

  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.

• Subtype

  Rocky terrestrial planet without atmosphere

  A rocky planet without an atmosphere is a solid body directly exposed to space, with no gas layer to protect or moderate surface conditions.

• Chemical element

  Roentgenium

  Roentgenium (Rg) is a synthetic, highly radioactive chemical element belonging to the category Transition metal, with atomic number 111 and atomic mass 282.0000 u (based on its most stable known isotope). This sheet…

• Chemical element

  Rubidium

  Rubidium (Rb) is an alkali metal with atomic number 37 and atomic mass 85.4678 u. It has a very low melting point and is highly reactive.

• Chemical element

  Rutenio

  Rutenio (Ru) is a chemical element belonging to the category Transition metal, with atomic number 44 and atomic mass 101.0700 u. This sheet describes its fundamental properties, periodic position and physical…

• Chemical element

  Rutherfordium

  Rutherfordium (Rf) is a synthetic, highly radioactive chemical element belonging to the category Transition metal, with atomic number 104 and atomic mass 267.0000 u (for its most stable isotope). This sheet describes…

• Astronomical type

  S-type asteroid

  An S-type asteroid is a rocky body dominated by silicates and nickel-iron, showing a relatively reflective surface and evidence of differentiated composition.

• Chemical element

  Samarium

  Samarium (Sm) is a chemical element of the lanthanide series, atomic number 62 and standard atomic weight 150.36 u. This entry describes its fundamental properties, periodic position and physical-chemical…

• Celestial object

  Saturn

  Saturn is a giant body dominated by a vast fluid envelope and an extensive ring system. Its internal layers and orbital structures form a system organized by gradients, rotations and gravitational interactions.

• Chemical element

  Skandio

  Skandio (Sc) is a chemical element belonging to the category Transition metal, with atomic number 21 and atomic mass 44.9560 u. This sheet describes its fundamental properties, periodic position and physical…

• Chemical element

  Seaborgium

  Seaborgium (Sg) is a chemical element belonging to the category Transition metal, with atomic number 106 and atomic mass 271.0000 u. This sheet describes its fundamental properties, periodic position and physical…

• Chemical element

  Selenium

  Selenium (Se) is a chemical element belonging to the category Metalloid, with atomic number 34 and atomic mass 78.9710 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

• Astronomical type

  Short-Period Comet

  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.

• Chemical element

  Silicon

  Silicon (Si) is a metalloid with atomic number 14 and atomic mass 28.0850 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

• Chemical element

  Arĝento

  Arĝento (Ag) is a chemical element belonging to the category Transition metal, with atomic number 47 and atomic mass 107.8682 u. This sheet describes its fundamental properties, periodic position and physical…

• Chemical element

  Sodium

  Sodium (Na) is a chemical element belonging to the category Alkali metal, with atomic number 11 and atomic mass 22.9900 u.

• Body type

  Star

  A star is a celestial body of fusing matter, maintaining equilibrium through gravity and emitting energy produced by internal nuclear reactions.

• Body type

  Stellar System

  A stellar system is a gravitational arrangement around a star, with various orbiting bodies forming a hierarchical and stable structure in space.

• Chemical element

  Strontium

  Strontium (Sr) is a chemical element belonging to the category Alkaline earth metal, with atomic number 38 and atomic mass 87.6200 u.

• Chemical element

  Sulfur

  Sulfur (S) is a chemical element belonging to the category Non-metal, with atomic number 16 and atomic mass 32.0600 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

• Classification

  Sulfuris

  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.

• Celestial object

  Sun

  As the central star and energetic engine, the Sun shapes the rhythms, orbital motions, and living conditions of surrounding worlds. It embodies the living balance of a constantly evolving system.

• Chemical element

  Tantalum

  Tantalum (Ta) is a chemical element belonging to the category Transition metal, with atomic number 73 and atomic mass 180.9500 u. This sheet describes its fundamental properties, periodic position and physical…

• Chemical element

  Technetium

  Technetium (Tc) is a chemical element belonging to the category Transition metal, with atomic number 43 and atomic mass [98]. This sheet describes its fundamental properties, periodic position and physical…

• Classification

  Telluris

  Telluris are rocky bodies of the dwarf planet class, without a permanent atmosphere, with a solid structure dominated by silicates, metals, and sometimes ice, preserving traits of the early protoplanetary disk.

• Chemical element

  Tellurium

  Tellurium (Te) is a chemical element belonging to the category Metalloid, with atomic number 52 and standard atomic mass 127.60 u. This sheet describes its fundamental properties, periodic position and physical…

• Chemical element

  Tenesino

  Tenesino (Ts) is a chemical element belonging to the category Halogen, with atomic number 117 and atomic mass 294.0000 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

• Chemical element

  Terbium

  Terbium (Tb) is a chemical element belonging to the category Inner transition metal, with atomic number 65 and atomic mass 158.9250 u. This sheet describes its fundamental properties, periodic position and physical…

• Astronomical type

  Terrestrial planet

  A terrestrial planet is a solid celestial body characterized by a rocky surface, high density, and a differentiated internal structure.

• Subtype

  Terrestrial planet with dense atmosphere

  A terrestrial planet with a dense atmosphere is a rocky body whose thick gaseous layer modifies surface temperature, pressure, and interactions with surrounding space.

• Subtype

  Terrestrial planet with thick and toxic atmosphere

  Rocky planet enveloped by a dense and poisonous atmosphere, where heat and pressure create an extreme environment dominated by opaque and corrosive clouds.

• Subtype

  Terrestrial planet with a thin and dry atmosphere

  A terrestrial planet with a thin atmosphere possesses a highly reduced and dry gaseous envelope, where the rocky surface interacts weakly with limited energy flows, forming an unprotected yet stable environment.

• Chemical element

  Thallium

  Thallium (Tl) is a chemical element belonging to the category Post-transition metal, with atomic number 81 and atomic mass 204.3800 u. This sheet describes its fundamental properties, periodic position and physical…

• Classification

  Thermocryas

  Thermocryas are a theoretical class of moderately warm ice giants, intermediate between Borealis and Pyrogiants in orbital irradiance. Warmer than classical ice giants yet below widespread ionization, they exhibit…

• Chemical element

  Thorium

  Thorium (Th) is a chemical element belonging to the Actinide series (inner transition metal), with atomic number 90 and atomic mass 232.0380 u.

• Chemical element

  Tulio

  Tulio (Tm) is a chemical element belonging to the category Inner transition metal, with atomic number 69 and atomic mass 168.9340 u. This sheet describes its fundamental properties, periodic position and physical…

• Chemical element

  Stano

  Stano (Sn) is a chemical element belonging to the category Post-transition metal, with atomic number 50 and atomic mass 118.7100 u. This sheet describes its fundamental properties, periodic position and physical…

• Chemical element

  Titanium

  Titanium (Ti) is a strong, lightweight, corrosion-resistant transition metal with atomic number 22 and atomic mass 47.87 u. Widely used in aerospace, medical implants and high-performance alloys.

• Chemical element

  Tungsten

  Tungsten (W) is a chemical element belonging to the category Transition metal, with atomic number 74 and atomic mass 183.8400 u. This sheet describes its fundamental properties, periodic position and physical…