In 2020, comet C/2019 Y4 ATLAS was expected to become a rare astronomical event, but it disintegrated soon after its discovery. Today, astronomers are still searching for one of its fragments, which may still be somewhere within our Solar System.

Initially, scientists predicted that comet ATLAS would become visible to the naked eye from Earth. However, its nucleus broke apart into several pieces, and experts believe that some of these fragments might still be orbiting the Sun.

Recently, a research team led by Salvatore A. Cordova Quijano from Boston University attempted to locate the so-called fragment B. To do this, they used the Lowell Discovery Telescope and data from the Zwicky Transient Facility. After the comet broke up, observations were also conducted using the Hubble Space Telescope, which captured several fragments that may still remain in the Solar System.

However, fragment B could not be found. This suggests that its diameter is likely less than one kilometer—too small for modern telescopes to detect.

Additionally, the moment of the comet's breakup was not observed up close, making it difficult to fully understand this phenomenon. The fate of this celestial object remains a mystery and raises new questions, particularly about how many similar fragments and potential comets might still exist in our Solar System.