The 'martian mothership' is the head from an electric razor stuck inside a window with Blu-tack. The milled edge of the head can be seen on close inspection, and there is a trace of the reflection of the chrome-plated object in the glass itself.
The 'silver saucer' above is an orange-squeezer made from glass. In this instance the object has been deliberately made out-of-focus, which hinders scientific investigation of the image. Many forged pictures are deliberately out of focus, and UFO pictures commonly reveal a frustrating lack of detail.
This amazing view of the moon is not an astronmical picture at all. This is a microscopic study of wallpaper, coated with emulsion paint. The paint bubbles have burst, leaving 'craters' which are very like those on the moon. The flying saucer itself is the head of a pin, and tracks nearby were made with the dry nib of a fountain pen.
The UFO above is a vegetable holder from a European kitchen slicer. In this case it was fixed to a window with a strip of adhesive tape, and the angle of the lighting was carefully adjusted to conceal the supporting strand.
This is a picture of the moon's surface, taken with a 3-inch refracting telescope (above). Superimposed in the photograhic enlarger is a sheet of glass on which the outlines of three UFO's have been drawn in Indian ink. The projected images are out of focus, which prevents anyone from commenting on details that might reveal the forgery.