Marking 20 years since the loss of space shuttle Challenger and its crew, the No Greater Love organization will donate to the Smithsonian National Air and Space Museum a special laser disk that was aboard the orbiter during its last mission.

The disk will be presented at the museum's flagship building on the National Mall in Washington on Saturday, Jan. 28, at 2:45 p.m., during a space-themed Family Day event.

Embedded on the disk is a record of thousands of signatures from children who signed a global Pledge of Peace. The pledge was sponsored by No Greater Love, the only humanitarian, educational, non-profit organization in the country solely dedicated to providing annual programs of friendship and care for those who have lost a loved one in the service of the United States or by an act of terrorism.

The disk, which will be placed in storage with other shuttle artifacts in the museum's collection, was recovered in 1986 among wreckage from Challenger. It will be presented to the museum by Ambassador Bruce Laingen, president of No Greater Love. There also will be a moment of remembrance to conclude the presentation. Also in attendance will be representatives from St. Francis de Sales School in Philadelphia, the first school to sign the pledge.

The museum's Mall building is located at Sixth Street and Independence Avenue S.W. The Jan. 28 Family Day, a bilingual event exploring the first lunar landing, will take place from 10 a.m. until 3 p.m. Admission is free.