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'''Planetary Geology''' is the scientific study of planets (including [[Earth]]), moons, and planetary systems, in particular those of the [[Solar System]] and the processes that form them. It involves the examination of planetary surfaces, crusts, atmospheres, and interiors. The discipline is a crossover between geology, astronomy, and astrophysics. Planetary geologists aim to understand the history of our [[Solar System]], the structure and composition of planetary bodies, and the processes that shape them.

==Overview==
Planetary geology, sometimes known as astrogeology or exogeology, is a multidisciplinary field that draws upon the principles of traditional [[geology]], [[astronomy]], and [[astrophysics]] to explore the formation, evolution, and current state of planets and their moons. It includes the study of planetary surfaces, the analysis of minerals and rocks, the investigation of tectonic and volcanic activities, and the assessment of water or ice presence and its past influence on the planet's geology.

==History==
The field of planetary geology emerged in the mid-20th century, following the advent of space exploration. The launch of [[Sputnik]] by the Soviet Union in 1957 and the subsequent missions to the Moon, Mars, and other celestial bodies provided scientists with the first direct evidence of the geology of other planets. The analysis of lunar rocks brought back by the [[Apollo missions]] significantly contributed to the development of the field.

==Key Concepts==
===Planetary Differentiation===
Planetary differentiation is the process by which a planet forms from a homogenous body of gas and dust into a stratified state with a core, mantle, and crust. This process is driven by heat from radioactive decay, accretion, and impacts.

===Impact Cratering===
Impact cratering is a fundamental process affecting planetary surfaces. It involves the collision of a planet or moon with a meteoroid, asteroid, or comet, resulting in the formation of a crater. Cratering records can provide valuable information about the age and history of a planetary surface.

===Volcanism===
Volcanism on other planets and moons can be similar to or vastly different from that on Earth. For example, the largest volcano in the Solar System, [[Olympus Mons]] on Mars, is much larger than any volcano on Earth due to Mars' lower gravity and lack of plate tectonics.

===Tectonics===
Planetary tectonics examines the structure and deformation of a planet's crust. Unlike Earth, which has active plate tectonics, other planetary bodies may exhibit different forms of tectonic activity, such as the global expansion seen on [[Europa]] or the wrinkle ridges on the Moon.

===Water and Ice===
The presence of water and ice plays a crucial role in planetary geology. Water can shape the landscape through erosion, transport sediment, and participate in chemical reactions. The discovery of water ice on the Moon and Mars has significant implications for future human exploration and the search for life.

==Planetary Geology of the Solar System==
Each body in the Solar System offers unique insights into planetary geology:

* [[Mercury (planet)|Mercury]]'s surface is heavily cratered and it has a large iron core.
* [[Venus]]' thick atmosphere and volcanic surface reveal a planet with a greenhouse effect gone extreme.
* [[Earth]] is unique with its abundant water, life, and active plate tectonics.
* [[Mars]] shows evidence of past water flows, ice caps, and the largest volcano in the Solar System.
* [[Jupiter]]'s moons, particularly [[Europa]], [[Ganymede]], and [[Callisto]], have icy surfaces with subsurface oceans.
* [[Saturn]]'s moon [[Titan]] has a thick atmosphere and lakes of hydrocarbons.
* [[Uranus]] and [[Neptune]]'s moons, such as [[Miranda (moon)|Miranda]] and [[Triton (moon)|Triton]], show evidence of past geological activity.

==Future Directions==
The future of planetary geology includes missions to asteroids, comets, and the outer planets' moons. These missions aim to further our understanding of the Solar System's formation and the potential for life on other planets.

==See Also==
* [[Astrobiology]]
* [[Geophysics]]
* [[Space exploration]]
* [[Comparative planetology]]

[[Category:Planetary science]]
[[Category:Geology]]
[[Category:Astronomy]]
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Planetary geology - Revision history

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