On June 15, 2020, a citizen scientist spotted a never-before-seen comet in data from the Solar and Heliospheric Observatory, or SOHO—the 4,000th comet discovery in the spacecraft’s 25-year history.
![](https://scx1.b-cdn.net/csz/news/tmb/2020/4000thcometd.jpg)
Source:
https://phys.org/news/2020-06-4000th-comet-solar-observatory.html