SuperRare

September 23, 1846

On this day, the planet Neptune was officially discovered by Johann Galle and Heinrich d'Arrest, marking a significant advancement in the field of astronomy. This discovery not only expanded the known boundaries of the solar system but also challenged and refined existing theories about planetary orbits and positions.

Neptune's discovery is characterized by its unique blue color, caused by methane in its atmosphere, and its retrograde rotation, which differs from most planets in our solar system. This event reshaped the understanding of planetary science and highlighted the importance of mathematics and observational technology in scientific discovery.

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