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VAN HORN, Texas — A private space company founded by Amazon.com CEO Jeff Bezos has launched an unmanned spaceship in its first test flight, the latest…
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Messenger was launched from Earth in 2004. After 4,104 orbits of Mercury and billions of miles of space travel, the orbiter ended its mission with a quiet bang Thursday.
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During astronaut Scott Kelly's year in space, scientists will compare his physiology with that of his twin brother, Mark, to study the effect of prolonged space flight on the human body.