Which two planets are the closest in size?
Mercury and Mars
Venus and Earth
Jupiter and Saturn
Uranus and Neptune
The diameters of Uranus and Neptune are respectively 25 362 km and 24 622 km -   the difference is only 2.92%.
reach: rather globalNeptuneplanetsspace
Answers by country
Mercury and Mars
Venus and Earth
Jupiter and Saturn
Uranus and Neptune
answers
 Estonia
Estonia10
 Greece
Greece11
 Pakistan
Pakistan16
 the United States
the United States94
 Australia
Australia19
 Poland
Poland2157
 Germany
Germany205
 India
India89
 Switzerland
Switzerland24
 the United Kingdom
the United Kingdom49
 Austria
Austria29