death tribble Posted September 17, 2018 Report Share Posted September 17, 2018 19 hours ago, Cygnia said: I got the magazine that this was in. Quote Link to comment Share on other sites More sharing options...
Cygnia Posted September 18, 2018 Report Share Posted September 18, 2018 Quote Link to comment Share on other sites More sharing options...
Greywind Posted September 18, 2018 Report Share Posted September 18, 2018 Happy Days are here again... Pariah 1 Quote Link to comment Share on other sites More sharing options...
Lord Liaden Posted September 18, 2018 Report Share Posted September 18, 2018 Okay, now I feel old... Quote Link to comment Share on other sites More sharing options...
Cygnia Posted September 22, 2018 Report Share Posted September 22, 2018 Quote Link to comment Share on other sites More sharing options...
Cygnia Posted September 23, 2018 Report Share Posted September 23, 2018 Quote Link to comment Share on other sites More sharing options...
Cancer Posted September 23, 2018 Report Share Posted September 23, 2018 False-color image reconstructed from the radar mapping data from the Magellan mission to Venus. There's also substantial vertical exaggeration. The brightness in the image does indicate "brightness" in the radar data, which largely corresponds to scale of roughness of the surface; a surface which is broken up into pieces whose size is comparable to the wavelength of the radar waves (~10 cm iirc) will be bright, because that's very effective at reflecting radio waves of that wavelength. The radar map was constructed using "side-looking" radar, that is, the transmitted beam was not pointed straight down at the planet, but rather at the "edge" of the planet as seen from orbit. This means also that reverse slopes (hillsides sloped away from the direction to the spacecraft) will always look dark, while slopes whose front is towards the spacecraft look bright. I forget the name of the peak in left background. It is a volcano. In fact, other than the impact craters and some features which are clearly windblown or wind-eroded stuff, more or less all of Venus's surface features are volcanic landforms of various sorts. The thing taking up much of the middle of the image is an impact crater. The bright ring is the raised crater rim, surrounded by the broken rocks of the ejecta blanket; the central peak is also quite bright. The rest of the crater floor is pulverized rock that has settled into a smooth and therefore dark plain in this image. The snaky bright lines running all over are grabens (valleys formed by the surface stretching, so blocks drop down) or are old lava flow channels whose tops are the chunky irregular cooled surface lava. Cygnia and Pariah 2 Quote Link to comment Share on other sites More sharing options...
Cygnia Posted September 28, 2018 Report Share Posted September 28, 2018 Trencher, Lord Liaden and Logan D. Hurricanes 3 Quote Link to comment Share on other sites More sharing options...
Logan D. Hurricanes Posted September 28, 2018 Report Share Posted September 28, 2018 38 minutes ago, Cygnia said: What is this? GIS thinks it is a tree stump. Quote Link to comment Share on other sites More sharing options...
Cygnia Posted September 28, 2018 Report Share Posted September 28, 2018 It's called 'The Huntress of Skipton Castle Woods ' Cancer and Logan D. Hurricanes 2 Quote Link to comment Share on other sites More sharing options...
Cygnia Posted September 29, 2018 Report Share Posted September 29, 2018 Quote Link to comment Share on other sites More sharing options...
Cancer Posted September 29, 2018 Report Share Posted September 29, 2018 Mars, part of the Valles Marineris, I think. Cygnia 1 Quote Link to comment Share on other sites More sharing options...
csyphrett Posted September 29, 2018 Report Share Posted September 29, 2018 Why is the ice running east-west? CES Quote Link to comment Share on other sites More sharing options...
archer Posted September 29, 2018 Report Share Posted September 29, 2018 1 hour ago, csyphrett said: Why is the ice running east-west? CES Go west, young iceberg. Quote Link to comment Share on other sites More sharing options...
Cancer Posted September 29, 2018 Report Share Posted September 29, 2018 5 hours ago, csyphrett said: Why is the ice running east-west? CES Fog, not ice (ditto, with image) Quote Link to comment Share on other sites More sharing options...
csyphrett Posted September 29, 2018 Report Share Posted September 29, 2018 2 hours ago, Cancer said: Fog, not ice (ditto, with image) So the fog is filling up the channel. Okay. Got that. CES Quote Link to comment Share on other sites More sharing options...
Greywind Posted September 29, 2018 Report Share Posted September 29, 2018 1 hour ago, csyphrett said: So the fog is filling up the channel. Okay. Got that. CES Give the set a smack and see if it clears it up. Quote Link to comment Share on other sites More sharing options...
Cygnia Posted September 30, 2018 Report Share Posted September 30, 2018 L. Marcus and Tom Cowan 2 Quote Link to comment Share on other sites More sharing options...
tkdguy Posted October 1, 2018 Report Share Posted October 1, 2018 Cancer, Logan D. Hurricanes and BoloOfEarth 3 Quote Link to comment Share on other sites More sharing options...
BoloOfEarth Posted October 1, 2018 Report Share Posted October 1, 2018 tkdguy, I just wanted to say that your profile picture goes very well with that Council of Wyrms posting. tkdguy 1 Quote Link to comment Share on other sites More sharing options...
Cancer Posted October 4, 2018 Report Share Posted October 4, 2018 Hope this isn't behind a subscriber wall ... Nature's choices (the magazine, not the domain) NB the third pic arguably belongs in the Cute Pics thread. Cygnia 1 Quote Link to comment Share on other sites More sharing options...
Cancer Posted October 4, 2018 Report Share Posted October 4, 2018 Kapoho, before and after last June The place we stayed for a week during our vacation in February 2014 is in the extensive area of brown-black in the "after" frame, and we swam in the little bay that isn't there any more. Quote Link to comment Share on other sites More sharing options...
Cygnia Posted October 7, 2018 Report Share Posted October 7, 2018 Quote Link to comment Share on other sites More sharing options...
Cygnia Posted October 7, 2018 Report Share Posted October 7, 2018 Quote Link to comment Share on other sites More sharing options...
Cancer Posted October 7, 2018 Report Share Posted October 7, 2018 P67/(double-barrelled name I can't recall). Nicely presented image. Quote Link to comment Share on other sites More sharing options...
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