1 min readBluford at the Tree Planting CeremonyNASAApr 15, 2011 Image Article Former astronauts Bonnie J. Dunbar talks with Guion S. (Guy) Bluford before the STS-107 tree planting ceremony . Former astronauts Bonnie J. Dunbar talks with Guion S. (Guy) Bluford before the STS-107 tree planting ceremony .Image Credit: NASA