Answer:
energetic particles
Step-by-step explanation:
"Pioneer 10" was the first aircraft to complete a mission to Jupiter. It was launched on March 2, 1972 and eventually became the first spacecraft to travel across the asteroid belt.
"Pioneer 11" was considered to be the second spacecraft to have studied the outer solar system after the launch of Pioneer 10. It focused on studying the asteroid belt, solar winds, cosmic rays and the condition surrounding Saturn and Jupiter.
Jupiter has a magnetosphere that constantly ejects energetic particles. It produces a lethal dose of radiation that is harmful, especially to humans. This damaged both Pioneer 10 and 11. However, Pioneer 10 is said to have been able to communicate with Earth for 30 years despite receiving damages.
So, this explains the answer.