Space MIAD Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Explorer 1, launched in 1958, proved the existence of what phenomenon?

The ionosphere

The Van Allen Belts

Explorer 1, which was launched on January 31, 1958, played a significant role in the advancement of space science by confirming the existence of the Van Allen Belts. These are zones of charged particles, mainly electrons and protons, that are trapped by Earth's magnetic field. The mission was critical because it provided the first evidence of how radiation interacted with the Earth’s magnetosphere, highlighting the importance of these belts in understanding radiation hazards in space. The scientific instruments aboard Explorer 1, particularly a cosmic ray detector, gathered valuable data that demonstrated that there was an area around Earth where high-energy particles were concentrated. This groundbreaking discovery opened up new areas of research in space science, leading to a deeper understanding of space weather and its effects on satellite technology and human spaceflight.

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Astronomical radiation

Microgravity effects

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