Your calling a mirage the only "reasonable" explanation further typifies your mentality. You do realize, right, that the pictures were captured with photographic equipment and are not a direct reflection of what the human eye saw? On top of that, there could be some magnification that doesn't necessarily translate into "mirage", since moisture in the air can (and usually does) magnify things. But that is different from a "mirage". "Mirages" are not a "reasonable" explanation because mirages are nearly always inverted and are always distorted and never as clear as what was seen there. How about Tycho's crater on the moon, which can be seen with the naked eye, is claimed to be 250,000 miles away and yet is said to be 70 miles in diameter. Something that's 70 miles in diameter cannot be seen with the naked eye from 250,000 miles away.