ກ່ອນ​ມະ​ນຸດ ຈະ​ລົງ​ໄປ​ຍ່າງ ເທິງດວງ​ເດືອນ ກໍໄດ້​ມີ​ການ​ສົ່ງ​ສັດ ຂຶ້ນ​ສູ່​ອະ​ວະ​ກາດ

Fifty years ago, two American astronauts became the first humans to walk on the Moon. But before humans had left Earth, animal astronauts blazed a trail into space. VOA’s Kerry Hensley has more.