Alan Ladwig, Senior Advisor to the NASA Administrator makes remarks during a tree planting event in honor of Earth Day and the 40th anniversary of the Apollo Program at NASA on April 22, 2009 at the National Arboretum in Washington, DC. The tree was grown from a second-generation seed, from seeds flown to the moon and returned to Earth by the crew of Apollo 14 in 1971. Getty Images logo Getty Images 7 months ago

Alan Ladwig, Senior Advisor to the NASA Administrator makes remarks during a tree planting event in honor of Earth Day and the 40th anniversary of the Apollo Program at NASA on April 22, 2009 at the National Arboretum in Washington, DC. The tree was grown from a second-generation seed, from seeds flown to the moon and returned to Earth by the crew of Apollo 14 in 1971.