Step 1 : Introduction to the question "What was Atlanta's Ponce City Market building previously?"
For more than 70 years, Pluto was one of nine planets recognized in our Solar System. However, in August 2006 the International Astronomical Union downgraded the status of Pluto to that of "dwarf planet." Pluto was no longer be considered a planet, due to new rules that said planets must “clear the neighborhood around its orbit.” Since Pluto’s oblong orbit overlaps that of Neptune, it was disqualified. The object formerly known as the planet Pluto was discovered on February 18, 1930 at the Lowell Observatory in Flagstaff, Arizona by astronomer Clyde W. Tombaugh.
