Was out walking my dog traveling east to west and looking at the moon because it is an unusually clear night. i noticed what looked like a string of anywhere from 15-20 lights traveling in a straight line, one behind the other, at what seemed to be a very high altitude and at a very high rate of speed. as the line of objects continued se they simply disappeared one at a time (from front of line to back of line) without any kind of spectacular effect. they simply vanished. i assume it is entirely possible that it was a disintegrating meteorite etc. but it appeared to me that the spacing of the objects alternated back and forth, from closer to farther away and back again. additionally, each light was identical in size. it didn't appear that each object was traveling at the same rate of speed at various times. my father was military and i've always been intrigued by aviation and am very familiar with flight patterns, typical aircraft behavior etc. i also studied aviation safety at the graduate level for 2 years. i've seen meteorites, comets, satellites, and even watched the space shuttle travel overhead in it's orbit many years ago. i've never seen anything like this in my life and it affected me viscerally. i do not assume that this was a ufo but wanted to record what i saw in the event that others saw what i did or if there were any recorded unusual aerospace events that could be explained by this.