Two silent, dim, pale yellow objects flying closely together directly overhead in West, Central Brampton, Ontario Canada

My teenage son and I were outside our house trying to set-up a small telescope we had recently purchased.  I was working on the telescope when my son said "Woah!...Look at that."  I looked up and we both watched as two objects quickly glided (no sound) overhead to the North.  We watched them for approximately 6 seconds until they disappeared behind close-by rooftops.  We were asking each other what they were as the event played out.  Initially I thought they were two ducks as they flew in tandem, one slightly higher than the other.  I quickly realized that ducks don't glow yellow!  I guess your mind tries to rationalize what you are seeing as you struggle to comprehend the unknown.
These objects appeared to be rather small (perhaps 8 to 10 feet across) and quite low in altitude; although I know this is not really possible to discern.  They appeared to be cup shaped; in the sense that they looked like a very shallow tea cup turned upside down but with a slight oval shape as opposed to circular.  They seemed to glow rather than brightly radiate light.  They were a very pale yellow-white on the underside with a light that was soft and dim.
We see a great many airplanes fly around us where we are as we are close to Pearson International Airport in Mississauga.  
These were not planes or anything I can define as man made.