There's a mysterious dwarf planet between Mars and Jupiter called 'Ceres' which has never been visited by spacecraft or photographed in detail, however, Earth-bound telescopes reveal a large bright shining spot on the surface of this planet, the origin and nature of which are unknown.
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Neil Armstrong, the first man to step foot on the moon, carried with him a piece of cloth and wood from the original 1903 Wright Flyer.
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In the last 7 years, humanity has discovered 43 potentially habitable planets.
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The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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Jupiter is bigger than all the other planets combined.
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On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
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The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
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