A spacecraft flyby turns a remote object into a sequence of changing views. New Horizons passed Arrokoth in January, three and a half years after its Pluto encounter; images taken from different angles were assembled into a black-and-white animation. The changing perspective makes the object's two lobes visible, while only hinting that the larger one may be substantially flattened. [shared-6a0532de01ebfee628ed79904a2a65a102b49609aa429174615653b42710ed8b]

That is the useful distinction between a striking image and a settled measurement. The animation helps viewers infer shape from motion, but the source describes the flattening as a suggestion, not a definitive finding. It also reports that Arrokoth differs from known asteroids in the inner Solar System and is likely made of two joined planetesimals—the early building blocks of planets. The qualification matters: likely composition is not direct proof of how those bodies formed. [shared-6a0532de01ebfee628ed79904a2a65a102b49609aa429174615653b42710ed8b]

The flyby’s value is access to a distant object that cannot be examined up close from Earth; the cost is that observations arrive through a brief passage and images, not repeated visits. New Horizons was still moving outward, adding about three Earth–Sun distances to its separation each year. The account would be weaker if later analysis showed the apparent lobes or flattening were artifacts of viewpoint rather than structure. [shared-6a0532de01ebfee628ed79904a2a65a102b49609aa429174615653b42710ed8b]

Source documents

  1. Passing Asteroid Arrokothhttps://science.nasa.gov/image-article/apod-2019-november-18-passing-asteroid-arrokoth/