The german ROSAT satellite will be falling back to earth sometime over the next day or two at the most (the time now being 645pm CDT 10/22/2011).
here is a bit about the satellite, a picture, and an artists rendition of the craft— as you can see.. its a rather large craft —
http://heasarc.nasa.gov/docs/rosat/rosgof.html
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Here is the link to track the satellite directly:
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Below is a screenshot of the satellite tracking module on n2yo.com :
Here is a link to the video explanation I put on youtube: