Humanity's interest in the heavens has been universal and enduring. Humans are driven to explore the unknown, discover new worlds, push the boundaries of our scientific and technical limits, and then push further. The intangible desire to explore and challenge the boundaries of what we know and where we have been has provided benefits to our society for centuries. Human space exploration helps to address fundamental questions about our place in the Universe and the history of our solar system. Through addressing the challenges related to human space exploration we expand technology, create new industries, and help to foster a peaceful connection with other nations. Curiosity and exploration are vital to the human spirit and accepting the challenge of going deeper into space will invite the citizens of the world today and the generations of tomorrow to join us on this exciting journey..
Why do some planets have no moons, like Mercury and Venus, and other planets have many moons, like Jupiter? How were those moons created? For that matter, how did the Sun, planets, comets, and asteroids form? Why are some moons so strange? Like Iapetus, for example, which travels around Saturn. One half of this moon looks really white, and the other side looks really black! Why would that be?
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