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The Moon arose: she shone upon the lake, — Moon

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"The Moon arose: she shone upon the lake, Which lay one smooth expanse of silver light; She shone upon the hills and rocks, and cast Upon their hollows and their hidden glens A blacker depth of shade."
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The Moon is the only natural satellite of Earth. It orbits around Earth at an average distance of 384,399 kilometres (238,854 mi), a distance roughly 30 times the width of Earth. It completes an orbit in relation to Earth and the Sun (synodically) every 29.5 days. The Moon and Earth are bound by gravitational attraction, which is stronger on the sides facing each other. The resulting tidal forces

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"The moon, obviously, has its advantages [over Mars when considering future human spaceflight missions]. It is several orders of magnitude closer to Earth, which makes it a superb training ground for missions to Mars. Decades from now, when the first astronauts headed to Mars finish firing their rocket engines, their ship will be on an inevitable course that will require months, if not years, to return to Earth, and they had better be prepared for every contingency. The moon is only a few days from our home planet. As every test pilot knows, you should always use a buildup approach when developing new aircraft. In the same vein, our future astronauts will be well served to use the ISS and moon as test beds for the first Mars missions."
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