NASA SOHO Website
Welcome to the STEREO Learning Center
Image artifacts - Background subtraction
Sometimes bright planets get mistakenly folded into the HI1 background calculations, creating dark "holes" in the data. For example, below is an image of the planet Venus as seen by HI1-B on September 15, 2009, compared with an image from a few days later. The computer is subtracting too much scattered light at the earlier location of Venus.
The planets Venus as seen by the STEREO Behind HI1 telescope on September 15, 2009
Hole seen 3 days later at previous location of Venus. Venus itself has moved slightly to the left. NASA EXPLANATION OFFICIAL WEBSITE
As you can clearly see, the two spheres filmed below are incredibly similar to NASA's official photo of Venus which now throws more doubt on the standard e-mail sent to anybody who question NASA on this subject!
So NASA which one of these two planets is VENUS?
http://gazbom.blogspot.com/2010/01/t...t-be-real.html