Telescopes have captured meteoroids hitting the Moon and several spacecraft imaged Comet Shoemaker–Levy 9 smacking into Jupiter in 1994. But impacts as they happen on another rocky world have never been observed.
![](https://scx1.b-cdn.net/csz/news/tmb/2021/messengersaw.jpg)
Source:
https://phys.org/news/2021-02-messenger-meteoroid-mercury.html