re: Opportunity reaches an interesting milestone
Bear in mind that the ellipse line we put on there is only a very rough guide based on the ellipse as marked on the large 10m/res version of the image on this page
http://www.msss.com/mars_images/moc/2004/01/24/
Hence - as we had to blow it up a LOT for the high res imagery we work with, the ellipse border turns into quite a wide area - consider it an 'error bar' - but I think it's safe to say now that Opportunity has indeed left it's landing ellispe. Basically, they are now in an area of terrain that they considered unsafe to land in.
Doug