On 31 March 2017, Jupiter’s moon Europa passed in front of a background star—a rare event that was captured for the first time by ground-based telescopes thanks to data provided by ESA’s Gaia spacecraft.
![](https://3c1703fe8d.site.internapcdn.net/newman/csz/news/tmb/2019/3-astronomerss.jpg)
Source:
https://phys.org/news/2019-07-gaia-astronomers-spy-europa-blocking.html