Though the 2023 DW tops the list, its ranking of 1 means only that “the chance of collision is extremely unlikely with no cause for public attention or public concern,” according to the Jet Propulsion Laboratory, while a 0 ranking means the “likelihood of a collision is zero, or is so low as to be effectively zero.” All other objects rank at 0 on the Torino scale. Video: Meteor, meteorite, asteroid, comet: What's the difference?īut the space rock - named 2023 DW - is the only object on NASA’s risk list that ranks 1 out of 10 on the Torino Impact Hazard Scale, a metric for categorizing the projected risk of an object colliding with Earth.
