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What was Brian O'Brien's field of expertise?

Biology
Space Science
Chemistry
Geology

Answer

Space Science was Brian O'Brien's area of expertise. He was a renowned scientist and astronaut who contributed significantly to the field of space exploration. O'Brien conducted groundbreaking research on the effects of space travel on the human body and developed innovative technologies for space missions. His expertise in space science played a crucial role in advancing our understanding of the cosmos and paving the way for future space exploration endeavors.