Another awesome thread. Thanks to all you Thunderbolters.
With regards to the Solar system's largest crater discussed in the beginning of this thread. Some later links took me the Google mars, which has an elevation feature, so I zoomed out and caught a screenshot of the whole of the planet. This to show 'the largest crater', or excavated northern hemisphere. Blue is the deeper areas, "sea level" is where green meets yellow, and going through orange and red is the highest elevation regions.
Now take a pause to look for a while, and notice how Valles Marinerus is connected to, and excavated to the same depth as, the northern hemisphere "crater". Something which struck me, I thought worth pointing out. Surely not just a coincidence.
While following the many wonderful links, I made a discovery in Melas Chasma
Cut from the image, and blown up.
I can't really judge how tall it is, but judging by the shadow length, it is as tall as the big cliffs elsewhere in the image. Then another link
had this image.
Those tall thin mesas might be what that thing is on Mars. The only thing is, it is the only one.
I also came across this awesome image of a bullseye crater, via a Google image search.
I followed the image to the article
, and had a good laugh.
An oddly shaped crater on the mid latitudes of the Martian northern hemisphere likely obtained its terraced profile from a surprisingly large subsurface ice deposit -- estimated at the combined size of California and Texas and about 130 feet thick, according to researchers at the University of Arizona's Lunar and Planetary Laboratory.
I had a cry too.
Besides failing to explain how subsurface ice effects crater formation, they failed to name the crater, only referring to it as "the terraced crater and others like it in the region".
At least they mention the region's name, Arcadia Planitia.