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Unmanned Spaceflight.com > All posts by a member| Posted on: Apr 23 2015, 02:56 PM | |
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Member  Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741 
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It's like watching pebbles on an earthly beach! |
| Forum: Opportunity · Post Preview: #219749 · Replies: 593 · Views: 516287 |
| Posted on: Mar 13 2015, 06:31 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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The first ever pictures of Ganymede taken by the Voyagers,it was evident there had been tectonic activity. Would a subsurface ocean of liquid water give rise to some form of plate tectonics as on Earth? |
| Forum: Jupiter · Post Preview: #218847 · Replies: 15 · Views: 27061 |
| Posted on: Mar 5 2015, 07:32 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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It's time to go back and explore! |
| Forum: Venus · Post Preview: #218645 · Replies: 139 · Views: 389419 |
| Posted on: Feb 14 2015, 03:17 AM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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So which image shows the real Mars? |
| Forum: Opportunity · Post Preview: #217986 · Replies: 593 · Views: 516287 |
| Posted on: Feb 10 2015, 10:57 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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I do understand the excitement of trying to Iinterpret features visible on Ceres but would rather wait and see knowing that we will be getting much improved images in the near future so various attempts at interpretation at this point in time seem to me to be premature. |
| Forum: Dawn · Post Preview: #217866 · Replies: 756 · Views: 1721531 |
| Posted on: Feb 7 2015, 07:59 AM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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The first far out images of Ceres make it look very similar to a Saturnian moon. |
| Forum: Dawn · Post Preview: #217790 · Replies: 756 · Views: 1721531 |
| Posted on: Dec 9 2014, 03:36 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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QUOTE (Gerald @ Dec 9 2014, 04:08 PM)  The largely basaltic composition of the rocks should imply only short exposure to liquid water. If physical weathering occurred either in cold highlands on the crater rim or during arid periods, and has then been transported within rather short time via alluvial fans and rivers to the lake, where it has been buried fast enough to prevent water from acting on the rock for too long, this could allow for the preservation of basaltic sediments. Since there probably hasn't been relevant plate tectonics on Mars, repeated exposure to surface water is less likely than on Earth. Regarding hematite: Color of the rock and CheMin results show significantly higher hematite at Pahrump than at YB. The good, and yet unswerded question is: If it's the same type of deposit (lacustrine in a shallow lake), how can the environment change between more and less oxidizing withing a geologically short period? Maybe the answer can be found by questioning the assumptions, implicite in the question. Correct if i'm wrong but I believe that pahrump hill rocks are at a higher elevation than yellowknife bay? |
| Forum: MSL · Post Preview: #216156 · Replies: 61 · Views: 76413 |
| Posted on: Dec 9 2014, 02:31 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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I followed yesterday's press conference and the evidence provided seems convincing that support a river, delta and lake system as the source for formation of Mount sharp. However, it remains confusing to me following a recent discussion as to why the rocks examined so far although showing some chemical alteration by water, remain largely of basaltic composition which would seem to limit the interaction of water with these rocks. Another thing is what significance is there in pahrump rocks showing a higher haematite content compared to rocks in yellow knife? |
| Forum: MSL · Post Preview: #216152 · Replies: 61 · Views: 76413 |
| Posted on: Nov 15 2014, 12:40 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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First of all I would like to congratulate the people at ESA for delivering the first lander to a a comet and provided us with a historical spectacle and looking forward to watching Rosetta in the next few months. It is sad to hear that Philae had to go to safe mode due to power issues. Did the drilling part work as some media is reporting it did. Do we have confirmation of that and do we have results? Media is also reporting that the lander was rotated by 35 degrees. Did it take a different view of the comet from the surface? Can anyone confirm these reports? |
| Forum: Rosetta · Post Preview: #215338 · Replies: 1412 · Views: 1230866 |
| Posted on: Nov 11 2014, 07:17 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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It's the Nautilus of captain Nemo! |
| Forum: Titan · Post Preview: #214763 · Replies: 166 · Views: 222485 |
| Posted on: Oct 27 2014, 08:33 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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And pahrump hills would be part of the Murray formation? Because then if yellow knife sediments are lower than the crater sediments, then the lake bed deposit hypothesis may still be relevant. Has there been any attempt to analyse gale crater floor layers by radar if that's even possible? |
| Forum: MSL · Post Preview: #214303 · Replies: 61 · Views: 76413 |
| Posted on: Oct 27 2014, 03:05 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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At what stratigraphic level are the yellow knife bay clay sediments in relation to the rock examined at Kimberly and pahrump hills? |
| Forum: MSL · Post Preview: #214296 · Replies: 61 · Views: 76413 |
| Posted on: Oct 25 2014, 12:00 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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How long in terms of time scale are we talking here when you refer to chemical weathering of deep ocean rocks takes longer than weathering of surface rocks in an oxygen rich earth atmosphere? Still my impression remains that water contact with basaltic rocks has been brief in most instances probably due to water instability on Mars surface. |
| Forum: MSL · Post Preview: #214249 · Replies: 61 · Views: 76413 |
| Posted on: Oct 24 2014, 12:36 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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Whereas it is true that we require more time and more landing site in situ investigation the likes of gale crater, meridian and gusev crater, I feel that the overall picture of the water story on Mars is somehow limited to volcanic, tectonic, hot spring activity . The next landing site for investigation i believe should be selected based on the presence of chlorides and carbonates rather than clay and sulphates. |
| Forum: MSL · Post Preview: #214202 · Replies: 61 · Views: 76413 |
| Posted on: Oct 14 2014, 06:56 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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Is there going to be another planetfest like gathering for the Pluto flyby? |
| Forum: New Horizons · Post Preview: #213801 · Replies: 116 · Views: 177027 |
| Posted on: Oct 2 2014, 09:20 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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Only now I realize who vikingmars is! I have 'visions of mars' in my mars books collection..brilliant work! |
| Forum: ISRO Mars Orbiter Mission · Post Preview: #213543 · Replies: 65 · Views: 166089 |
| Posted on: Sep 30 2014, 03:45 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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What about dust clouds resulting from a dust storm? Are they white in colour? |
| Forum: ISRO Mars Orbiter Mission · Post Preview: #213495 · Replies: 65 · Views: 166089 |
| Posted on: Sep 30 2014, 12:06 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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I'm no expert in image processing but I would think this version of red colour seems more real cos I don't believe the dust clouds to the upper left would be that white as depicted in Ted 's version. |
| Forum: ISRO Mars Orbiter Mission · Post Preview: #213489 · Replies: 65 · Views: 166089 |
| Posted on: Sep 25 2014, 02:58 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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QUOTE (elakdawalla @ Sep 25 2014, 03:53 PM) A second photo. This one is actually at the camera's full resolution of 2048 pixels square! Can anybody identify the location? It's the southern hemisphere for sure but I wouldn't dare say exactly where |
| Forum: ISRO Mars Orbiter Mission · Post Preview: #213384 · Replies: 65 · Views: 166089 |
| Posted on: Sep 19 2014, 04:21 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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What's the true colour of this rock? Is it as white as it looks in black and white pictures? |
| Forum: MSL · Post Preview: #213136 · Replies: 546 · Views: 439254 |
| Posted on: Jul 30 2014, 07:13 AM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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first impression, that sand looks too deep for the rover to traverse |
| Forum: MSL · Post Preview: #211433 · Replies: 493 · Views: 331869 |
| Posted on: May 28 2014, 01:09 AM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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I suppose that Meridiani should be darker in colour but there certainly is a big difference the way MARS looks from pictures taken by Opportunity at Meridiani and Curiosity at Gale. I wonder how real that difference is! |
| Forum: Opportunity · Post Preview: #209923 · Replies: 360 · Views: 284218 |
| Posted on: Oct 10 2013, 03:38 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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I recall lunar regolith behaving the same way being very fine and sticky |
| Forum: MSL · Post Preview: #203723 · Replies: 258 · Views: 162277 |
| Posted on: Oct 10 2013, 08:38 AM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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Mod: Edited. Read rule 3.5. Judging from this picture it seems that Martian dust behaves like wet sand here on Earth. Any reason for that? Thin atmosphere perhaps.  |
| Forum: MSL · Post Preview: #203717 · Replies: 258 · Views: 162277 |
| Posted on: Jul 11 2013, 12:29 PM | |
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Member Group: Members Posts: 363 Joined: 13-April 06 From: Malta Member No.: 741
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Given the close proximity of Charon and Pluto I could imagine that both would exert tidal forces on each other with heating effects within both celestial bodies very similar to the Earth Moon system! This makes me think of tantalizing possibilities even as this far out as they are in the solar system! Its only a matter of time now. |
| Forum: New Horizons · Post Preview: #201561 · Replies: 1628 · Views: 1114094 |
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