Gigantic 3000 Mile Wide UFO Disc Filmed From Space Station

massive 3000-mile wide disc was caught in a NASA slide above the earth and nobody knows exactly what it is.

The image was taken from the ISS and was first shown at a Brasilia Planetarium Presentation in 2013.

The question has been asked, ” Is it an alien mothership or a planetary defense shield?”

I think it is very interesting that they discovered so big and that nobody knows what it is.