Dawn's first orbit, including RC3, March 6, 2015- June 15, 2015 |
Dawn's first orbit, including RC3, March 6, 2015- June 15, 2015 |
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#1
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Member ![]() ![]() ![]() Group: Members Posts: 204 Joined: 14-April 06 From: Seattle, WA Member No.: 745 ![]() |
Dawn is now officially in orbit around (1) Ceres!
Congratulations, NASA. Nice images of crescent Ceres. NASA Spacecraft Becomes First to Orbit a Dwarf Planet |
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#2
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 ![]() |
QUOTE Once ejected onto the floor of the crater any Water would rapidly sublimate leaving bright white salt lakes behind. Thus this phenomena is impact, location and time dependent. Other bright deposits elsewhere may also be where the same criteria have been met to varying degrees at different times and are the result of briny ejecta. It does puzzle me though, why these postulated salt flats and briny ejecta have not been buried under later deposits of darker dust and organics. Is fresh brine still seeping onto the surface? Is the salt in the form of large, semi vertical crystals which shed any dust and debris? Could the old salt flats produced by this process have been buried in the past and then been re-exposed when more recent impacts occur in the right place? |
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