Aqui le sdejo un texto que encontré en internet sobre este caso (está en ingles... ahora lo traduzco)..

"A WILD story about three very large objects headed towards earth have started sprouting all over the internet. I first saw it on Examiner and of course, like all the other hogwash on there, I had to verify the validity of the story. The story claims that an astrophysicist by the name of ‘Craig Kasnov’ that works for SETI has discovered three large objects headed towards earth. The big red flag was the supposed quote from this imaginary friend saying that the largest object was probably around ‘tens of kilometers’ in size and it’s estimated landing on Earth would be in December of 2012, just in time for the Mayan prophecies. If you have half of a brain you can see whats wrong with that statement, but in case you don’t, allow me to point out that anything that was so far away that it wouldn’t arrive for another two years would not be visible at that size. For that matter, there are many things on the moon that are about a kilometer in size that our telescopes can’t make out and the moon is right in our cosmic backyard! It was only after I had searched the entire SETI directory that I found out he is not even a part of the SETI organization. Of course! I’m always a day late and a dollar short. The images being spread all over the place were actually taken 20 years ago and are simply a fleck on the camera lens. If you look at the same coordinates today through a live sky map, nothing’s there. GASP! You don’t say? But I do!"