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Space exploration in when you go beyond Earth's atmosphere. Its when you discover with a spacecraft with or without a crew. -
It increases our knowledge, its helps us prove or disprove scientific theories on Earth, it helps us know the weather, protect our planet, etc. -
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Space exploration started on October 4 1957. This is an ongoing discovery even right now. People are now exploring star clusters, celestial structures, star systems, planets, galaxies, and etc.