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Unlike all the planets closer to the Sun, known since antiquity, the farthest reaches are the discoveries of the modern world. Uranus was discovere...

The Moon is the only body in the solar system outside of the Earth that has been visited by humans. More than 440 pounds of lunar material are brou...

Jupiter and Saturn are the two largest planets in the solar system and the first two gas giant planets encountered when moving away from the Sun. T...

Mars exploration has never been more active, and our understanding of the planet is advancing rapidly. New discoveries reveal gullies carved by rec...