2 spheres flying in formationI was looking North from my balcony. 2 small spheres appeared from behind a cloud. There altitude seemed to be between 10,000 to 15,00 feet. They flew in formation from the northeast to the southwest makeing a slight direction change to fly directly to the west. they were flying very close to eachother one right behind the other, both roughly the same sphere shape and slightly diffrent colors of a greenish orange. I cant extimate their speed since i didnt have a referance point but they seemed to be going very fast covering the length of the sky in about 15 seconds.