The Verge says NASA is putting on a colorful light show in the sky tonight "Tonight's sunset might look rather unusual if you live on the East Coast of the United States. NASA will be launching a rocket from the Wallops Flight Facility in Virginia that will release payloads of barium and strontium into the atmosphere, turning parts of the night sky blue-green and others red."
"The rocket is scheduled to launch between 7:00PM and 9:00PM ET, and the chemical payloads will be released about six minutes after liftoff. NASA says that it should be visible as far as 235 miles north of the launch site (New York City and Long Island), 232 miles south of it (near Morehead City, North Carolina), and 165 miles west (Charlottesville, Virginia). That all depends on the weather conditions, though. If you're having trouble seeing it, or live outside that area, NASA will also be streaming the event, which we will embed above when it goes live."