Orange yellow sphere size of small house hovers above trees 50 feet away from young girl on country lane

Behind a small practice driving range being built by my dad,in a still countrified unpopulated outer suburb of Pittsburgh, we saw a very large orangish/red slightly pulsating sphere.  It was about as big as a small house, and it was about 50 feet away from us, hovering behind and above a group of trees where a one house country lane ends to becomes dirt path into the forest. 
After remaining as a whole sphere for about 7 minutes it began to slowly disappear in unsymmetrical blotches over a period of about 2 minutes-appearing to me as if it were transmigrating into another dimension.
Date may be approximate, although the witness does not indicate that fact.  PD