The first men and women who traveled in space — in the 1960s — depended on the sacrifices of other animals that gave their lives for the advancement of human knowledge about the conditions in outer space.
On September 20, 1951— the U.S. Air Force launched the first animal flight near space that ended with a live occupant. The nosecone on the Aerobee rocket carried a monkey named Yorick and 11 mice to a height of 45 miles. Space is said to began at 50 miles. When the animals were recovered alive, it went down in the record book as the first successful flight near space for living creatures.