4 orange colored objects, low to the ground, flew west to east over sunset park. each one was spaced about a minute apart.4 round, orange objects appeared during one minute intervals flying west to east over southwest elkhorn. each one flew the exact same route, and no sound came from any of them. they seemed to have a faint white halo around the orange light. it was a beautiful, star filled evening and these appeared to fly just above tree line. after the 4th one disappeared over elkhorn, i noticed a peculiar 'chemical' smell in the air. i got the chills observing this and smelling the odd odor.