A mysterious "continuously active" object known as a "Trojan asteroid" has been discovered in Jupiter's orbit, making it the first known object like it. The object, known as 2019 LD2, has a ...

When comparing two objects, people either rely on internal memories of these objects or run their hands and eyes over them to directly perceive their similarity. The latter approach, a shortcut that ...

ATLAS image of asteroid 2019 LD2 from late June 2019. Stars seem to streak by in the left panel because the images have been shifted and added to follow 2019 LD2, but the comet itself (indicated by ...