Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Neptune , the Solar System's outermost gas giant planet, is 30 times further from the Sun than Earth. Twelve years after a 1977 launch , Voyager 2 flew by Neptune and found surprising activity on a planet that receives only 3 percent as much sunlight as Jupiter . This mosaic of 5 Voyager images shows Neptune's Southern Hemisphere.
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