Neptune circles the Sun so far out that one full orbit takes about 165 Earth years — so a Neptunian “birthday” is rarer than a human lifetime.
At roughly thirty times Earth’s distance from the Sun, sunlight is weak and the year stretches with the long, slow track. Voyager 2’s 1989 flyby is still our only close look.
Extreme years teach scale. The outer solar system does not just feel colder; it runs on a different calendar entirely.
Shahzad Mahota
A year on Neptune lasts about 165 Earth years
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