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A pale blue-green enigma, the planet Uranus has long fascinated astronomers precisely because of its extreme distance, some 1.6 billion miles (2.6 billion km) from Earth. While it is comparatively ...

Much of our understanding of Uranus comes from Voyager 2's flyby, which to date remains the only time a spacecraft has visited the planet. Voyager 2's data on the magnetosphere surrounding Uranus has ...

Throughout most of recorded history, humankind had known only six planets, five in the sky — Mercury, Venus, Mars, Jupiter and Saturn — plus Earth once it became generally accepted in the 17th century ...