【實用教育app】Space Exploration|最夯免費app

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Space exploration is the discovery and exploration of outer space by means of space technology. Physical exploration of space is conducted both by human space flights and by robotic spacecraft. While the observation of objects in space, known as astronomy, pre-dates reliable recorded history, it was the development of large and relatively efficient rockets during the early 20th century that allowed physical space exploration to become a reality.

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