Scientific discovery is a funny thing. Sometimes it occurs quite accidentally, sometimes after a conscious search. A perfect example of the latter is the discovery of the planet Neptune. Astronomers ...
Why it's so special: Only one spacecraft has ever visited the eighth and most distant planet from the sun. On Aug. 25, 1989, NASA's Voyager 2 spacecraft took the first-ever close-up images of Neptune.
The eighth and most distant planet from the sun, Neptune, reaches opposition with the sun on Sept.23, when it will be in its best position for viewing for the year. Neptune is too faint to see with ...
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