Jupiter Storm – A swirling storm in reality 30,000km wide and may have existed since before 1665, but the present spot was first seen only after 1830 and well-studied only after a prominent apparition in 1879. The storm people had seen in the 1600s may have been a different storm than the one we see today. A long gap separates its period of current study after 1830 from its seventeenth-century discovery; whether the original spot dissipated and reformed, whether it faded, or even if the observational record was simply poor, are all unknown.