Giant UFO near Earth on ISS photo

In March 2014, the Brasilia Planetarium has released a surprising photo taken by ISS. In fact, on this it appears a massive and circular unknown anomaly. But, what is it? This case is very mysterious…

ADGUK News states:

Ok, this image was released by the Brasilia Planetarium recently and seems to show a massive disc shaped object stationed above the Earth. The disc is estimated to be around 3-5 thousand miles in diameter. If you look at the bottom left of the image you can see a cloud formation passing over the top of the anomaly, this indicates that the object is not a projection onto the earth. I have no idea what this object is, I can only speculate at this point. I have contacted the Planetarium for further clarification regarding the slide, and will post an update when I get an answer.