Moon's Lack of Atmos. vs Titan's Abundance

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SUMMARY

The discussion centers on the contrasting atmospheric conditions of Titan, Saturn's largest moon, and Earth's Moon. Titan, with a mass of 1.3455 x 1023 kg and a surface temperature of 94K, possesses a dense atmosphere with a pressure of 1500 mbar, significantly higher than that of Earth's Moon, which has a mass of 7.3483 x 1022 kg and experiences extreme temperature fluctuations from -233°C to 123°C. The key factors influencing these differences include gravitational force and ambient temperature, which affect gas retention capabilities.

PREREQUISITES
  • Understanding of gravitational forces and their impact on atmospheric retention
  • Knowledge of thermodynamics, particularly gas behavior at varying temperatures
  • Familiarity with planetary science concepts, especially regarding moons and their atmospheres
  • Basic comprehension of atmospheric pressure measurements and their significance
NEXT STEPS
  • Research the atmospheric composition of Titan using data from the Cassini-Huygens mission
  • Explore the effects of temperature on gas escape velocity in planetary atmospheres
  • Study the gravitational differences between Earth and its Moon versus Titan and Saturn
  • Investigate the role of distance from the Sun in determining the thermal characteristics of celestial bodies
USEFUL FOR

Astronomers, planetary scientists, and students of astrophysics interested in the comparative study of planetary atmospheres and the factors influencing their formation and retention.

danihel
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hello, how come moon is too small to hold any atmosphere and titan has so much atmosphere?
 
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The moons of Jupiter and Saturn, and for that matter Uranus and Neptune are quite cold because of their distance from the sun. Temperature means that gas molecules do not necessarily achieve escape velocity even in a weak gravitational fields. The further away, the colder the ambient temperature.

Titan (Saturn's largest moon)
Mass 1/45 that of Earth (1.3455 x 1023 kg)
Surface temperature 94K (-180 °C)
Atmospheric pressure at surface 1500 mbar (1.5 times Earth's)

http://www.esa.int/esaMI/Cassini-Huygens/SEMMF2HHZTD_0.html

http://solarsystem.nasa.gov/planets/profile.cfm?Object=Titan


Earth's moon
http://solarsystem.nasa.gov/planets/profile.cfm?Display=Facts&Object=Moon
Mass 7.3483 x 1022 kg

Minimum/Maximum Surface Temperature
Metric: -233/123 °C
English: -387/253 °F
SI: 40/396 K
 
thanks a lot for such a clear answer
 

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