More than 100 paper planes have been found since their launch last month from Oklahoma's spaceport in Burns Flat.
About 550 were launched March 24 with the help of a metal cage and a weather balloon. They rose 95,345 feet above Earth before being released. Most planes hurled toward the ground at the speed of sound. Scientists said the planes experienced temperatures of 100 degrees below zero on the way down.
About 100 of the brightly colored planes were found near the space vehicle when it landed in Piedmont.
Those planes belonged to students at 38 Oklahoma junior highs and middle schools, including Classen School of Advance Studies, Mayfield and Crooked Oak in Oklahoma City; and Whittier and Longfellow in Norman; Tecumseh; Stillwater; Wellston; Vinita; and Carl Albert in Midwest City.
The Oklahoma Space Industry Development Authority is sending the schools a certificate next week to let them know their airplane traveled to the edge of space.
Ten planes have been found by residents in fields, ditches and roads.
The first plane landed near Coyle - 50 miles from the release point over El Reno - about 11 hours after the launch. That plane belonged to a student in Claremore.
The next eight planes were found within two days near Kingfisher. The eight planes belonged to students in Madill, Oklahoma City, Ardmore, Salina, Pauls Valley and Snyder.