48 reactions | • Observation of Comet 2I/Borisov in October 2019 10.3.23 • On 12 October 2019, the NASA/ESA Hubble Space Telescope observed Comet 2I/Borisov at a distance of approximately 420 million kilometres from Earth. The comet is believed to have arrived here from another planetary system elsewhere in our galaxy. • Credit: NASA, ESA, D. Jewitt (UCLA) | Astronomy Nation | Facebook