Which rover was the first to explore Mars?
Curiosity
Opportunity
Sojourner
Spirit
Sojourner was the first Mars rover. It was much smaller than Curiosity, whose wheel is about the size of the whole Sojourner. It landed on July 4, 1997 as part of the Mars Pathfinder mission on Mars's Ares Vallis and remained in contact with Earth till September 27, 1997.
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Answers by country
Curiosity
Opportunity
Sojourner
Spirit
answers
Republic of Ireland
15
the United States
82
Australia
27
the Philippines
12
India
138
Greece
12
the United Kingdom
46
France
13
Austria
28
Pakistan
14
Poland
4812
Germany
146