The Mothership and its Orb

I went to let my dog out in the back yard as I was waiting I noticed an orb in the sky which seemed to be circling the area of my back yard but it was way up in the sky.  At first I thought it might be the spotlight from Mystic Lake, but I was wrong because it wasn't a beam of light it was an orb.
I ran in the house to get my roomate to see and he said him and his friend seen the same thing a few nights ago.  Then he looked to the west and hovering just above the neighbors trees was a huge object which my roomate commented was the Mothership and thats exactly what it looked like.  
The orb itself was a light white greenish color and round the "Mothership" had faded lights all around it and a green hue behind it.  I have never seen anything so spectacular in my life!  
We watch for about 10 mins and the orb just kept circling and the "Mothership" just stayed hovering.  I went back out about an hour later and they were both gone---