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Based on the provided passage, which idea can be logically inferred regarding space missions? [Passage Context: As humanity's technological capacities expand, space missions have evolved into complex, multi-layered endeavours. While space agencies highlight breakthroughs, internally they grapple with uncertainties: whether the science justifies the cost, whether the technology can withstand unpredictable cosmic environments, and whether long-term goals align with immediate needs on Earth. International collaboration brings complications such as disagreements over priorities and data-sharing. The rise of private aerospace companies introduces commercial ambition, which critics argue risks replacing science with spectacle. Furthermore, planetary ethics and contamination risks remain unaddressed by complete oversight mechanisms. Despite these dilemmas, space missions continue to captivate audiences due to deeper human motivations to explore.]