As you drive down the road leading to Jodrell Bank Observatory, a sign asks visitors to turn off their mobile phones, stating that the Lovell telescope is so powerful it could detect a phone signal on Mars.
![](https://scx1.b-cdn.net/csz/news/tmb/2019/moon.jpg)
Source:
https://phys.org/news/2020-11-4g-network-moon-bad-news.html