a rectangular object, with an orange glow, was moving slowly over a wheat field.

A friend and I were sitting in a car, approximately 5 miles outside of town, when we saw a light coming across the field toward our car.  At the time, several teen boys in town owned small motor scooters and it looked like the headlight of one. 
We had been watching the light for about 30 seconds when it turned to its right and headed west across the field.  Still thinking it was a scooter, we didn't become scared at the time.  A few seconds later an orange glow appeared and ,for lack of a better word, dominoed into a rectangular object about the size of a small trailer house. 
I remember being terrified and screaming at my friend that we should leave.  We had no trouble starting the car and quickly drove into town.  
We became braver the closer we came to town and decided to drive back out to the area.  When we arrived at the area, the object was gone.  
My friend died in a car accident in 1975, leaving me as the only witness to this sighting.
Witness indicates that date of incident is approximate; does not indicate town in which alleged sighting occurred.  PD