193096y ago
Discovery
Pluto discovered
Clyde Tombaugh spotted Pluto on photographic plates at Lowell Observatory in Flagstaff, Arizona — the ninth planet (later reclassified as a dwarf planet in 2006).
02·18
On This Day in Space
18 February
Anniversaries
1
Year range
1930
Source
Curated
CategoriesDiscovery1