The sun's most distant planet has completed its first full orbit since humans first laid eyes on it 165 years ago
It’s been a long year for Neptune. A full 165 Earth years ago, German astronomer Johann Galle first spied the icy blue giant giving wide berth to the sun some 2.8 billion miles from the solar system’s center. Today, it’s right back where we found it again, marking one full Neptune year since the planet’s discovery.
Neptune, of course, has a somewhat tumultuous and storied history. It was the most distant planet in our solar system before Pluto was discovered in 1930, pushing Neptune to 8th and second-most-distant. When Pluto was downgraded to a dwarf planet it was again elevated to superlative status.