A rare planetary alignment that occurs once every 175 years allowed Voyager to reach Saturn #OTD in 1980 in just over three years, with little on-board propulsion. Voyager snapped this shot on October 18 as it made its approach. . . . . . . . . . #nasa #space #exploration #planets #saturn #voyager #planetsalign #orbit #cosmos #earth #sartunsrings #photography #nature #universe