James A. Van Allen

James A. Van Allen was an American physicist best known for his work in space science, particularly in the study of cosmic radiation and the Earth's magnetic field. He played a pivotal role in the early days of space exploration, discovering the Van Allen radiation belts—two layers of charged particles trapped by Earth's gravity and magnetic field. These belts help protect our planet from harmful solar and cosmic radiation. Van Allen's research contributed significantly to our understanding of space plasma physics and the interactions between solar wind and planetary atmospheres, influencing both space missions and satellite technology.