UFOs On Google Maps?

We'll probably hear a good explaination in days or weeks, but here's a phenomenon that people have found while Google Siteseeing: Difuse blobs on the satellite images that are not explained.

http://www.mikeslist.com/2005/05/ufos-spotted-on-google-maps.html

http://www.googlesightseeing.com/2005/05/12/ufo/

Now, let's just put on our Fox Mulder hats for a little bit. Suppose that we are under constant survelliance by aircraft, be that alien or perhaps [warning: conspiracy theory] experimental millitary. And suppose that there is a cloaking mechanism that would make these aircraft "transparent" when viewed from the ground against a cloudless blue sky. That same mechanism might not be as effective when viewed from above, and could explain what's in these photos.

Or, maybe it's a flaw in the stitching program that Google/Keyhole uses. Who knows.