If you’re on the east coast tonight, keep an eye on the sky between 7pm and 9pm: NASA is launching a test of some new tech that will include releasing colorful vapor tracers 130 miles above the Earth. It sounds like it’s going to be beautiful. The vapors will be ejected from a sounding rocket launched from Wallops Flight Facility in Virginia. NASA explains that it has actually been injecting various vapor tracers into the atmosphere since the 1950s—these trails help scientists understand “the naturally occurring flows of ionized and neutral particles” in the upper atmosphere by injecting color tracers and tracking the flow across the sky.

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