 
| No. | Bet | Duration | Stakes | Predictor | Challenger | 
|---|---|---|---|---|---|
| 317. | No human will set his or her foot on Mars and return safely to earth before 2050. | 42 years 02007-02049 | |||
| 343. | 15 years 02008-02023 | ||||
| 681. | 6 years 02015-02020 | 
Predictions that Schwieder has challenged.
| No. | Bet | Duration | Stakes | Predictor | Challenger | 
|---|---|---|---|---|---|
| 351. | One or more space agencies will send a manned mission to Mars by 2035. | 27 years 02008-02035 |