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Planetary geology, alternatively known as astrogeology or exogeology, is a planetary science discipline concerned with the geology of celestial bodies such as planets and their moons, asteroids, comets, and meteorites.
[12] [13] In the Dune series, planetologists are employed to understand planetary resources and to plan terraforming or other planetary-scale engineering projects. [ 12 ] [ 13 ] This fictional position in Dune has had an impact on the discourse surrounding planetary science itself and is referred to by one author as a "touchstone" within the ...
The Earth's climate system is a prime example of an emergent property of the whole planetary system, that is, one which cannot be fully understood without regarding it as a single integrated entity. It is also a system where human impacts have been growing rapidly in recent decades, lending immense importance to the successful development and ...
A foundational idea in Earth science is the notion of uniformitarianism, which states that "ancient geologic features are interpreted by understanding active processes that are readily observed." In other words, any geologic processes at work in the present have operated in the same ways throughout geologic time.
Today, the mission of the USGS Astrogeology Science Center is to serve the nation, the international planetary science community, and the general public's pursuit of new knowledge of our Solar System by [citation needed]: Conducting innovative, fundamental research that advances the fields of planetary cartography, geoscience, and remote sensing.
History of planetary geology – the history of the planetary science discipline concerned with the geology of the celestial bodies, such as the planets and their moons, asteroids, comets, and meteorites. History of geomorphology – history of the scientific study of landforms and the processes that shape them
In 1976, two new time scales were defined [9] to replace ET (in the ephemerides for 1984 and afterwards) to take account of relativity. ET's direct successor for measuring time on a geocentric basis was Terrestrial Dynamical Time (TDT). The new time scale to supersede ET for planetary ephemerides was to be Barycentric Dynamical Time (TDB).
When the equilibrium state has been reached then large scale conversion of kinetic energy to heat ceases. In that sense the equilibrium state is the lowest state of energy that can be reached. The Earth's rotation rate is still slowing down, though gradually, by about two thousandths of a second per rotation every 100 years. [ 1 ]