Swift mission tallied water from interstellar comet Borisov

For the first time, NASA’s Neil Gehrels Swift Observatory tracked water loss from an interstellar comet as it approached and rounded the Sun. The object, 2I/Borisov, traveled through the solar system in late 2019.

Source:
https://phys.org/news/2020-04-swift-mission-tallied-interstellar-comet.html