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.
The last two planes, found March 29 and April 1, belonged to students in Yukon and Tulsa.
About 400 airplanes have not been found.
Melissa Smith, space authority spokeswoman, said several planes have probably landed but have yet to be found , especially because most have been found in rural parts of Oklahoma.
"I'm fully expecting people three months from now to register some," Smith said.
Joan Horvath, president of Takeoff Technologies, said most of the 400 planes are probably blowing around Oklahoma fields.
She said some could have landed much farther east because of a storm that moved through Oklahoma the night of the launch.
"They might have been rained down from the sky or they might have gotten convectioned up. If that happened, they might get found in Europe," Horvath said.
"It could be kind of neat."
For a spaceplane locator map or to register a plane, log onto NewsOK.com.Archive ID: 1026820