2I/Borisov was discovered on 30 August 2019 by amateur astronomer Gennady Borisov. Following the appearance of interstellar object ‘Oumuamua in 2017, this was the second object from another solar system ever discovered wandering through our cosmic neighbourhood. In December 2019 astronomers took a closer look at 2I/Borisov using the Atacama Large Millimeter/submillimeter Array (ALMA), a giant radio telescope in Chile.
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