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Planetary habitability is the measure of a planet's or a natural satellite's potential to develop and maintain environments hospitable to life. [1] Life may be generated directly on a planet or satellite endogenously or be transferred to it from another body, through a hypothetical process known as panspermia . [ 2 ]
Planetary habitability in the Solar System is the study that searches the possible existence of past or present extraterrestrial life in those celestial bodies. As exoplanets are too far away and can only be studied by indirect means, the celestial bodies in the Solar System allow for a much more detailed study: direct telescope observation, space probes, rovers and even human spaceflight.
Atmospheric entry (sometimes listed as V impact or V entry) is the movement of an object from outer space into and through the gases of an atmosphere of a planet, dwarf planet, or natural satellite. There are two main types of atmospheric entry: uncontrolled entry, such as the entry of astronomical objects, space debris, or bolides; and ...
The absolute ages of the landforms are not known. Callisto is composed of approximately equal amounts of rock and ice, with a density of about 1.83 g/cm 3, the lowest density and surface gravity of Jupiter's major moons. Compounds detected spectroscopically on the surface include water ice, [15] carbon dioxide, silicates and organic compounds.
Carbon dioxide is a chemical compound with the chemical formula CO2. It is made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature and at normally-encountered concentrations it is odorless.. As the source of carbon in the carbon cycle, atmospheric CO 2 is ...
John Tyndall FRS (/ ˈ t ɪ n d əl /; 2 August 1820 – 4 December 1893) was an Irish physicist and chemist. His scientific fame arose in the 1850s from his study of diamagnetism . Later he made discoveries in the realms of infrared radiation and the physical properties of air, proving the connection between atmospheric CO 2 and what is now ...
Gauss's law for gravity – Restatement of Newton's law of universal gravitation; Jordan and Einstein frames – different conventions for the metric tensor, in a theory of a dilaton coupled to gravity; Kepler orbit – Celestial orbit whose trajectory is a conic section in the orbital plane
Astrobiology (also xenology or exobiology) is a scientific field within the life and environmental sciences that studies the origins, early evolution, distribution, and future of life in the universe by investigating its deterministic conditions and contingent events. [2] As a discipline, astrobiology is founded on the premise that life may ...