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Outgassing can be estimated by comparing radiogenic and primordial noble gas ratios in a planets atmosphere. The abundances of the radiogenic 40K, U, and Th are assumed to be roughly constant for all terrestrial planets. The noble gas ratios may be altered by atmospheric escape processes.

Outgassing is the slow release of a gas that was trapped, freezing, Absorption or adsorbed in some material....
of near surface ices by solar radiation.

outgassing: The release of gases from a planet's interior.
ovoid: Geological features on Uranus's moon Miranda thought to be produced by circulation in the solid icy mantle and crust.

Outgassing - The release of gas from the interior of a planet or satellite
Ozone - A molecule consisting of three oxygen atoms. Ozone molecules are responsible for the absorption of solar ultraviolet radiation in the Earth's atmosphere ...

Outgassing and volcanic activity produced the primordial atmosphere. Condensing water vapor, augmented by ice delivered by comets, produced the oceans.

~ and volcanic activity produced the primordial atmosphere of the Earth. Condensing water vapor, augmented by ice and liquid water delivered by asteroids and the larger proto-planets, comets, and trans-Neptunian objects produced the oceans.

The ~s of the Earth was stripped away by solar winds early in the history of the planet till a steady state was established, the first atmosphere.

~ (NASA Thesaurus / NASA SP-7, 1965) The evolution of gas from a material in a vacuum. outliers (landforms) (NASA Thesaurus) Areas or groups of rocks surrounded by rocks of older age. Used for klippen.

O star Stars of spectral type O are very hot blue stars with surface temperatures of about 35,000 K, whose spectra are dominated by the lines of singly ionized helium. ~ Venting of volatile gases from the heated interior of a solid body.

~ The evolution of gas from a material in a vacuum. out of phase The condition of two or more cyclic motions which are not at the same part of their cycles at the same instant. Also called out of step. Compare in phase.

2: Cryogenic volcanism and ~
The ~ theory states that Titan's atmosphere arose primarily via ~ of volatiles accreted onto the surface as clathrates or hydrates.

This was designed to detect radon ~ events on the surface of the moon. The APS recorded alpha particle signatures of radioactive decay of radon gas and its daughter product, polonium.

Dragonchild: I've got to wonder if perhaps the comets ~ combined with a little spin might get to the peanut shape. Comets will tend to spin with the axis perpendicular to the orbit. This would be reenforced when they approach the sun.

"The scale of an active comet depends on the level of ~ rather than the size of the nucleus," adds Jones. "Comet nuclei aren't necessarily active over their entire surfaces; what we can say is that McNaught's level of gas production was clearly much higher than that of Hyakutake." ...

Which of the following things would tend to make a thick atmosphere: cold temperature, high gas particle mass, weak gravity, ~ from the interior (volcanic eruptions)?

The Soviet spacecraft Phobos 2 detected a faint but steady ~ from Phobos. Unfortunately, Phobos 2 died before it could determine the nature of the material; water is the best bet. Phobos 2 also returned a few images (right).

An absorbent material (in the form of small pellets) used in low-temperature cryostats to trap gases released gradually after active pumping has ceased. See ~.
Symbol: z A prefix denoting 10-21. For example, 1 zeptometer (zm) = 10-21 meter (m).

Lunar Prospector mapped the surface composition, measured magnetic and gravity fields, studied lunar ~ events, and prospected for minerals. The information will help humans can go back to the Moon to build a base and learn to live off the land.

Non-gravitational forces:- Forces that alter the path of a comet, which are not caused by gravitational interaction with the Sun and planets. Typically this refers to uneven ~ from vents on the comet, which serve to act like rocket nozzles.

~ from our planet's interior through volcanoes, fissures, and geysers produced an atmosphere rich in hydrogen, nitrogen, and carbon compounds and poor in free oxygen. As Earth cooled, ammonia, methane, carbon dioxide, and water formed. The stage was set for the appearance of life.

While there are still occasional large impacts, the Moon was considered to be geologically dead until evidence of ~ (rapid releases of gas that blow off surface deposits and expose less weathered materials) within the past 10 million years was announced on November 9, 2006 (more).

The release of gas from a planets interior.
Ozone Layer
In earth's atmosphere, the layer of oxygen ions (O3) lying 15 to 30 km high that protects the surface by absorbing ultraviolet rays.
Parallax ...

See also: See also: What is the meaning of Planet, Earth, Solar, Orbit, Atmosphere?

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