A galactic visitor entered our solar system last year — interstellar comet 2I/Borisov. When astronomers pointed the Atacama Large Millimeter/submillimeter Array (ALMA) toward the comet on Dec. 15-16, 2019, for the first time they directly observed the chemicals stored inside an object from a planetary system other than our own.
Click here for original story, ALMA reveals unusual composition of interstellar comet 2I/Borisov
Source: ScienceDaily