7-10 orbs that first looked like stars moving in a line, south towards Lake Ontario.

Hello, I was out walking my dog the other week around 11:00 pm and saw something curious. I saw three stars in the sky and thought it was Orion's belt, but then noticed that were slowly moving southbound towards Lake Ontario.
 The three orbs (they just looked like stars, they were very distant) moved along at a constant pace, southbound. Then I noticed another orb appear on the north end of the line, also moving southbound. More orbs started appearing in this fashion in a straight line, steadily moving southbound. When the line was about 5 orbs long, the southmost one would disappear. Approximately 7-10 orbs appeared and travelled along this route until they faded from the sky one by one reaching the "end" of the line .
 Nothing crazy, just thought it seemed curious and I didn't know what they could be.