NASA · Aerospace · 2004
Twin of Spirit (MER-B). Landed at Meridiani Planum on 25 January 2004 and operated for 5,352 sols (over 14 years), traveling a record 45.16 km — the longest off-Earth drive in history. Discovered the first definitive evidence of past liquid water on Mars. Lost contact during a global dust storm in June 2018; mission officially ended February 2019.
| Category | Aerospace |
| Status | Active |
| Year | 2004 |
| Origin | USA |
| Height | 1500 mm |
| Weight | 185 kg |
| Payload | 1.5 kg |
| Speed | 0.05 m/s |
| Degrees of freedom | 5 |
| Battery | 480 Wh |
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