Four orange spherical glowing lights moving slowly in formation at tree top level at 10 pm over Poteau, OK.Saw three round or spherical shaped orange glowing lights traveling from the Southeast to Northwest at about tree top level over our backyard in a residential neighborhood. Three of the four objects where moving in a straight line formation at a very slow pace headed on a gradual upward incline and each object eventually disappeared at the same position in the sky. Their speed and spacing never changed. The fourth object appeared after the first three objects disappeared. The fourth object moved in the same manner and at the same level in the sky as the other three objects, but in the sky across the street. The objects appeared to be fairly small, about the size of a grapefruit and made no sound.