Summarize this sentence:
19 August 1960: Aboard the Soviet Union's Sputnik 5, the first animals (two dogs, Belka and Strelka) and a range of plants are returned alive from space.
19 August 1960: Aboard the Soviet Union's Sputnik 5, the first animals (two dogs, Belka and Strelka) and a range of plants are returned alive from space.