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  2. Geology of solar terrestrial planets - Wikipedia

    en.wikipedia.org/wiki/Geology_of_solar...

    e. The geology of solar terrestrial planets mainly deals with the geological aspects of the four terrestrial planets of the Solar System – Mercury, Venus, Earth, and Mars – and one terrestrial dwarf planet: Ceres. Earth is the only terrestrial planet known to have an active hydrosphere . Terrestrial planets are substantially different from ...

  3. Planetary boundaries - Wikipedia

    en.wikipedia.org/wiki/Planetary_boundaries

    Stockholm Memorandum (2011) Scientists have affirmed that the planet has entered a new epoch, the Anthropocene. In the Anthropocene, humans have become the main agents of not only change to the Earth System but also the driver of Earth System rupture, disruption of the Earth System's ability to be resilient and recover from that change, potentially ultimately threatening planetary habitability ...

  4. Solar System - Wikipedia

    en.wikipedia.org/wiki/Solar_System

    720,000 km/h (450,000 mi/h) [ 10] Orbital period. ~230 million years [ 10] The Solar System[ d] is the gravitationally bound system of the Sun and the objects that orbit it. [ 11] It was formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc.

  5. Solar System model - Wikipedia

    en.wikipedia.org/wiki/Solar_System_model

    The scale of the planets is the same as the scale between them, and the planets are represented by everyday objects; the Earth is a peppercorn, Jupiter is a walnut, and Neptune is a coffee bean. (dismantled) Saint-Louis-du-Ha! Ha!, Quebec: 1:10,000,000,000 0.1 m 0.1 cm 15 m 0.6 km (dismantled) (est. 1985) Lafayette Walk Detroit, Michigan

  6. List of natural satellites - Wikipedia

    en.wikipedia.org/wiki/List_of_natural_satellites

    The prograde satellites consist of the Himalia group and three others in groups of one. The retrograde moons are grouped into the Carme, Ananke and Pasiphae groups. Saturn has 146 moons with known orbits; 66 of them have received permanent designations, and 63 have been named. Most of them are quite small. Seven moons are large enough to be in ...

  7. Earth Similarity Index - Wikipedia

    en.wikipedia.org/wiki/Earth_Similarity_Index

    The Earth Similarity Index ( ESI) is a proposed characterization of how similar a planetary-mass object or natural satellite is to Earth. It was designed to be a scale from zero to one, with Earth having a value of one; this is meant to simplify planet comparisons from large databases. The scale has no quantitative meaning for habitability .

  8. Terrestrial planet - Wikipedia

    en.wikipedia.org/wiki/Terrestrial_planet

    A terrestrial planet, telluric planet, or rocky planet, is a planet that is composed primarily of silicate, rocks or metals. Within the Solar System, the terrestrial planets accepted by the IAU are the inner planets closest to the Sun: Mercury, Venus, Earth and Mars. Among astronomers who use the geophysical definition of a planet, two or three ...

  9. List of planet types - Wikipedia

    en.wikipedia.org/wiki/List_of_planet_types

    List of planet types. From top to bottom: Mercury, Venus without its atmosphere, Earth and the Moon, Mars, Jupiter, Saturn, Uranus, and Neptune in false colour (not to scale) The following is a list of planet types by their mass, orbit, physical and chemical composition, or by another classification. The IAU defines that a planet in the Solar ...

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