Subject Region
Earth (Planet)
14
United States
9
Solar system
7
Universe
4
Great Britain
3
Soviet Union
3
Germany
2
Greece
2
Nigeria
2
Outer space
2
Québec (Province)
2
Rome
2
Canada
1
China
1
Czechoslovakia
1
England
1
Florence (Italy)
1
France
1
Hydra (Greece)
1
London
1
Mars (Planet)
1
Netherlands
1
Origin
1
Papua New Guinea
1
Philippines
1
Sri Lanka
1
Venus (Planet)
1