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7B8
Posted on: Nov 30 2018, 11:31 AM


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QUOTE (MahFL @ Nov 27 2018, 04:45 PM) *
The PI did say small rocks would be pushed aside by the Mole, but if it hit a big flat rock then that was as far as they could go, it won't go upwards. It's all about risk.


In that context, I found this publication helpful (https://elib.dlr.de/121308/1/Spohn_et_al-20...nce_Reviews.pdf). I also wondered how well the mole would cope with any buried rocks.

They say:
QUOTE
If the Mole encounters a rock larger than a few 10s of cm as it moves forward, it could be blocked from further advancement. The likelihood of such an encounter between the surface and the required (3 m) or target (5 m) depths
has been calculated to be 43% and 59%, respectively. This estimate uses the most pessimistic models, [...]


QUOTE
If less conservative assumptions are made about surface rock abundance (e.g., 2.5% or less) and demonstrated capabilities of the Mole are allowed for (e.g., the Mole can push rocks up to 15 cm out of its way within the regolith, and can also deflect around rocks encountered at angles ≤45 degrees), the probability of success increases to 98% and 90%, respectively.
  Forum: InSight · Post Preview: #242238 · Replies: 474 · Views: 87566

7B8
Posted on: Apr 5 2013, 04:13 PM


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QUOTE (centsworth_II @ Apr 4 2013, 07:52 PM) *
Phoenix's Lidar Beam produced the first laser light show on Mars.
http://photojournal.jpl.nasa.gov/catalog/PIA11030


Thanks for all your answers. That's fascinating. I just think that having an artificial light source on Mars has quite a symbolic character considering how important light always has been for us and how much we sometimes celebrate the illumination of buildings, bridges, places, trees etc.
  Forum: MSL · Post Preview: #199551 · Replies: 842 · Views: 266583

7B8
Posted on: Apr 4 2013, 01:28 PM


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QUOTE (fredk @ Mar 30 2013, 07:07 PM) *
It's not clear to me how much the LEDs would help during the day, but at night that should work.


A bit out of context, but talking about night-time LED made me wonder when the first artificially light on Mars was switched on? I don't think it is MSL as the Phoenix lander had some red, green, and blue LEDs to illuminate the inside of the scoop. Does anybody know if another lander/rover had some LEDs and when it was switched on for the first time? (I couldn't find any relevant information in this forum or otherwise. I might just not know where to look for it...)
  Forum: MSL · Post Preview: #199523 · Replies: 842 · Views: 266583

7B8
Posted on: Nov 6 2012, 02:35 PM


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QUOTE (ronald @ Nov 5 2012, 09:52 PM) *
While still waiting for all Falconbridge files I did a quick try on Gertrude - Sol 3117:
[attachment=28818:1P404893...422LCM_x.JPG] [attachment=28820:1P404893...22LFCM_x.JPG]


Any idea what process can cause the ring-like crack in the lower left half the rock?
  Forum: Opportunity · Post Preview: #194234 · Replies: 581 · Views: 79994

7B8
Posted on: Aug 11 2012, 10:58 PM


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QUOTE (Zeehond @ Aug 11 2012, 11:00 PM) *
First High-Resolution Color Mosaic of Curiosity's Mastcam Images:

High-Resolution Color Mosaic


What a scenery! There's so much to see. Looks great for a walk. If you look NE towards the rim it almost looks like a road winding down the mountains. I guess, it might be the big channel you can spot on the CTX image.
  Forum: MSL · Post Preview: #188215 · Replies: 1152 · Views: 545913

7B8
Posted on: Mar 25 2012, 05:09 PM


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QUOTE (Stu @ Feb 24 2012, 11:48 PM) *
[...]
That last one shows the ISS moving through the sky too...


Not as good as your images in particular because of the wind shaking my tripod. I took these photos on the Feb 25, 2012 in Shropshire, UK. The ISS passed right between Venus and the Moon.
  Forum: Chit Chat · Post Preview: #183632 · Replies: 58 · Views: 18055


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