Dawn's Survey Orbit at Ceres |
Dawn's Survey Orbit at Ceres |
Jun 15 2015, 05:47 PM
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
daily Ceres picture from the survey orbit
http://dawn.jpl.nasa.gov/multimedia/images...tml?id=PIA19572 I started a new topic, as we are no longer in the first orbit phase |
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Jun 23 2015, 06:08 PM
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
ZLD, I think that the answer is the same. Any semi-liquid substance viscous at Ceres' surface temperature will have a vapor pressure, and since there's no atmosphere there should be a substantial amount of diffusion. Even lava would have volatile fractions (as you mentioned) like sulfur. Ceres is known to be water-rich, though.
Bottom line is that I think we're still seeing the effects of CCD saturation by high-albedo surface solids, not gas or vapor. Whatever that stuff is (and my bet is ice) it's WAY reflective. Gonna require even higher-resolution views to make sense of it. -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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