Jupiter probe

Pioneer 10 was the first probe to explore the outer Solar System, successfully navigating through the asteroid belt and coming just 85,000 miles above Jupiter's surface. Jupiter is a ball of hot liquid hydrogen mixed with some helium, a constitution much like that of the Sun.
 (NASA) United States 1973 Jupiter probe

Pioneer 10 was the first probe to explore the outer Solar System, successfully navigating through the asteroid belt and coming just 85,000 miles above Jupiter's surface. Jupiter is a ball of hot liquid hydrogen mixed with some helium, a constitution much like that of the Sun.