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
flagAustralia
20%
13%
46%
20%
15
flagthe Philippines
36%
9%
45%
9%
11
flagIndia
36%
16%
37%
9%
83
flagthe United Kingdom
51%
3%
33%
12%
33
flagthe United States
45%
8%
32%
13%
37
flagPoland
35%
21%
23%
19%
4104
flagPakistan
50%
8%
16%
25%
12
flagGermany
48%
18%
9%
24%
33