LAMO, aka Low Altitude Mapping Orbit |
LAMO, aka Low Altitude Mapping Orbit |
Nov 11 2011, 10:23 PM
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#1
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
I think is time to start this new topic, now that Dawn is more than half-way in the transition from HAMO to LAMO (as showed in the plot below).
-------------------- I always think before posting! - Marco -
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Dec 20 2011, 12:55 AM
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#2
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Newbie Group: Members Posts: 5 Joined: 6-July 11 Member No.: 6050 |
Is it just me, or does that sharp, young crater in the top right of the image below have gullies in its walls that look remarkably similar to those in craters on Mars? The debate has been raging for some years now whether Martian crater gullies are formed by dry flow or by the flow of brine. I'm not suggesting for one moment that there's liquid flowing on the surface of Vesta, but the similarity of gullies here might suggest that most, if not all, Martian gullies formed via a dry mechanism.
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Dec 20 2011, 06:54 PM
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#3
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Member Group: Members Posts: 311 Joined: 31-August 05 From: Florida & Texas, USA Member No.: 482 |
Is it just me, or does that sharp, young crater in the top right of the image below have gullies in its walls that look remarkably similar to those in craters on Mars? The debate has been raging for some years now whether Martian crater gullies are formed by dry flow or by the flow of brine. I'm not suggesting for one moment that there's liquid flowing on the surface of Vesta, but the similarity of gullies here might suggest that most, if not all, Martian gullies formed via a dry mechanism. I noticed that same feature and assumed it was a landslide triggered by the same mechanism that created the apparent fault above the rim. As to what caused the fault, I'm not sure. I believe the "dry flow" mechanism for small scale flows of sediment on craters of Mars requires dry ice as the volatile that sublimates and then causes unweathered sediment to be exposed, making a dark band. I don't think the landslide on Vesta pictured here would be applicable to those discussions. |
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