Two photos taken with the Hubble space telescope last week show that comet C / 2019 Y4 broke into at least 55 pieces. C / 2019 Y4 was first detected in December 2019 by the ATLAS astronomical robot system of the University of Hawaii, USA. Astronomers have predicted it will increase its brightness and be visible to the naked eye in May 2020, becoming one of the most spectacular comets in the past two decades. However, C / 2019 Y4 suddenly dimmed since mid-March, causing many experts to speculate that the comet's core may have been fragmented or disintegrated. This hypothesis was confirmed on April 11 after amateur astronomer Jose de Queiroz first captured three comet fragments.