Risk scale
The Torino Scale
A 0–10 scale, like a hazard traffic light, for communicating the risk of a near-Earth object to the public — combining impact probability and energy into a single colour-coded number. Apophis briefly reached level 4, the highest ever, before further observations returned it to zero.
Highlights
- ›Apophis reached level 4 — the highest ever recorded
Surveys, missions & objects
Knowledge connections
- Associated withRisk Assessment
- Associated with99942 Apophis
- Associated withCNEOS
Sources
The primary and reference sources this topic draws on.
- NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.