winter2 said:
I like it how he offhandedly not only determines it's a ship, but is also able to determine their technology. ("clearly cloaked")
This man is a genius.
Let me play devil's advocate for a moment: We actually have a fabric here on earth that can bend light around it, and radar, cloaking tech is not all that far-fetched. (Source info: http://www.physorg.com/news/2010-11-meta-flex-brand-invisibility.html )
So there is that, plus, I have to point this out, in theory is a species could make it here from another system, odds are that they could handle a few CMEs to their hull. So maybe they just don't care. They would have to protect themselves from a myriad of known and unknown (to us) dangers, for example, gamma ray bursts.
Now, there is something a silly about the official explanation, and just hear me out on it, again, I'm not making up my mind, just gathering info. The explanation tells us how they process images, and they use images from the previous day to do so. This leaves dark spots in the final images where objects were, which you can see directly to the right of Mercury, but the unknown object is actually further than that, and the only way that could have happened is if they had used images from the previous TWO days to process them, which they explicitly contradict by stating they use images from the previous day. Follow me on this?
TL;DR: Basically I'm saying that the explanation given doesn't explain the image, but it could still be some sort of strange image artifact rather than an alien ship.