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Unformatted text preview: Jovian subnebula due to the greater gravitational potential energy release, mass, and proximity to the Sun, greatly reducing the NH 3 inventory accreted by Callisto and Ganymede. The resulting N 2 atmospheres may have been too thin to survive the atmospheric erosion effects that Titan has withstood.  An alternative explanation is that cometary impacts release more energy on Callisto and Ganymede than they do at Titan due to the higher gravitational field of Jupiter . That could erode the atmospheres of Callisto and Ganymede, while the cometary material would actually build Titan's atmosphere. However, the 2 H/ 1 H (i.e., D/H) ratio of Titan's atmosphere is 2.3±0.5×10 −4 ,  nearly 1.5 times lower than that of comets .  The difference suggests that cometary material is unlikely to be the major contributor to Titan's atmosphere....
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.
- Fall '10