Future Venus Missions |
Future Venus Missions |
Jul 1 2005, 01:30 AM
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Solar System Cartographer Group: Members Posts: 10173 Joined: 5-April 05 From: Canada Member No.: 227 |
Oh well, might as well start that new topic since it's already well advanced in the Juno area...
My perspective on landers is as follows. All the landers we've had so far were dropped blind onto an essentially unknown surface. Any future landers can be targeted for specific terrains. It really is not true that we have had representative landings. Even a descent image or two, a panoramic photo plus a bit of surface composition, from a simple Venera-class lander just updated a bit, would be useful if we could put several down at well chosen targets. My choices would be: Examples of the main plains units (smooth, fractured, ridged) tesserae high elevation radar-bright tesserae large fresh lava flow unit ('fluctus') crater dark parabola crater ejecta outflow unit dunes area. And I have always assumed, rightly or wrongly, that it would be relatively easy to put these down, so they ought to be fairly inexpensive as planetary landers go. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Mar 18 2019, 06:19 PM
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Director of Galilean Photography Group: Members Posts: 896 Joined: 15-July 04 From: Austin, TX Member No.: 93 |
Probably some quantum tunnel magic I suppose. The Dr mentioned that as the temperature rises your speed would increase since it is easier to flip bits but your error margin would decrease. Dealing with bad bits is NAND bread&butter though so it should be easy enough to mitigate.
Yeah modern flash memory now is MLC, basically instead of just reading a straight 0 or 1, it reads mid-level voltage levels and translates that into 000 001 010 011 etc. That makes it extremely susceptible to disturbs (reading bits at X,Y has a chance of messing up their neighbors), lowers the lifetime of the cell when turned off as the electrons slowly drain, and much more vulnerable to radiation induced damage. MRAM is still fairly young tech for semiconductors (original Space Shuttle used ferrite cores, so the concept has been around a long time!), but based on her talk there is plenty of run room and the potential for very high densities. -------------------- Space Enthusiast Richard Hendricks
-- "The engineers, as usual, made a tremendous fuss. Again as usual, they did the job in half the time they had dismissed as being absolutely impossible." --Rescue Party, Arthur C Clarke Mother Nature is the final inspector of all quality. |
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