Space agencies should continue to explore Mars for evidence of past habitability.
Humans have been exploring Mars since the 1960s in an effort to learn more about how planets form, develop, and whether they have ever supported extraterrestrial life.
Only unmanned spacecraft have visited the red planet thus far, but that may soon change. In order to advance exploration, numerous new missions are launched before NASA's goal of having the first humans set foot on Mars in the 2030s.
Exploring Mars will help scientists learn about momentous shifts in climate that can fundamentally alter planets.
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