Rev 129 - Mar 29-Apr 17, 2010 - Dione D2 |
Unmanned Spaceflight.com > Outer Solar System > Saturn > Cassini Huygens > Cassini's ongoing mission and raw images  |
Rev 129 - Mar 29-Apr 17, 2010 - Dione D2 |
 Apr 12 2010, 01:35 AM
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#31
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Member  Group: Members Posts: 104 Joined: 1-June 08 Member No.: 4172  |
Radiationwise, the surface area of a given body is always the same: the area subtended by the body from the perspective of an observer at a distance of infinity in the direction the radiation is coming from. That is, there is no possible path of an incoming ray that would hit the surface of a highly-fractured Dione but not a smooth Dione. The same argument applies to cratering. However, that doesn't mean there aren't other reasons why a high surface area could increase outgassing - but it's unlikely that such a property could actually cause outgassing that would not otherwise occur at all.
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Apr 12 2010, 02:34 AM
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#32
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Senior Member Group: Members Posts: 1582 Joined: 14-October 05 From: Vermont Member No.: 530 |
QUOTE (jekbradbury @ Apr 11 2010, 09:35 PM)  That is, there is no possible path of an incoming ray that would hit the surface of a highly-fractured Dione but not a smooth Dione. And if Dione is reflective? |
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Apr 13 2010, 04:41 PM
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#33
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 Senior Member Group: Members Posts: 1417 Joined: 26-July 08 Member No.: 4270 |
Same response.
Even if Dione is reflective, only the surface in our line of sight can reflect particles toward us. -------------------- -- Hungry4info (Sirius_Alpha)
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Apr 28 2010, 05:03 AM
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#34
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 Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
April, 20 view (N00153311/12/13-RGB filters-motion compensated):
-------------------- I always think before posting! - Marco -
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