With its impeccable landing on Thursday, NASA’s Perseverance became the fifth rover to reach Mars—so when can we finally expect the long-held goal of a crewed expedition to materialize?
![](https://scx1.b-cdn.net/csz/news/tmb/2021/radiationwil.jpg)
Source:
https://phys.org/news/2021-02-america-rovers-marswhen-humans.html