Rocket tracers, nightime (via NASA)
In the military, soldiers sometimes use tracer rounds to help them direct fire onto an opposing target. The tracer projectile uses a pyrotechnic charge that makes the bullet burn brightly and therefore visible to the naked eye. NASA has taken a page from the military’s tracer principal and adapted it to their ATREX (Anomalous Transport Rocket Experiment) program.
Five rockets were launched in succession 80 seconds apart to study the Jetstream at high altitude (65 miles up) but keeping an eye on the rockets is difficult to say the least. In order to maintain a better visual lock-on of the sounding rockets (2 X Terrier-Improved Malemutes, 2 X Terrier-Improved Orions and 1 Terrier-Oriole), NASA equipped each with a chemical tracer (unknown as to what chemical) that formed a ‘milky white cloud’ at altitude that enabled researchers to visually see the wind speeds found at that height as well as the rockets trajectory. Two of the five rockets launched carried weather instrumentation (I suspect human subjugation tech as well) that measured temperature, pressure and wind speed to better understand Earth’s upper atmosphere.
Tracers or further fodder for the "Chemtrail Conspiracy?"