Neptune. Image Credit: NASA, Voyager 2
Neptune: At 2.8 billion miles from the Sun, Neptune is the farthest and last planet in our solar system (sorry Pluto.) Only visited by a manned spacecraft once, Neptune is a planet shrouded in mystery. One such mystery is the disappearance of a giant Earth-size storm. When voyager 2 visited neptune, this large storm was raging in the Southern hemisphere, but it has since disappeared. Another storm popped up on the Northern hemisphere, but that one disappeared too. Neptune has 13 moons and even has a faint ring system. Neptune is different from Jupiter and Saturn, because while it does have helium and hydrogen like them, its atmosphere is also rich in methane, giving it its unique blue color. For now, we don’t know much about Neptune, but in the coming decades, it is likely an unmanned spacecraft will be sent its way.

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